https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:intro-variables/v/what-is-a-variable 2023-05-23T10:28:13.689545116Z What is a variable? Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values. For example, when calculating total earnings at a job with an hourly wage plus tips, a variable can represent the fluctuating tips, making it easier to determine total income. Sal Khan video https://cdn.kastatic.org/googleusercontent/Z0Ew0H4CUDZ7Hc0NbhfLe904T2e_lMEyScP69jTH-2Kcauq4mxzwzwDS-yQlWeQlDKGfOS3-podwVZQRor01fOc What is a variable? Variables in math are symbols, often letters, that represent different values in various situations. They help us understand and solve problems with changing values. For example, when calculating total earnings at a job with an hourly wage plus tips, a variable can represent the fluctuating tips, making it easier to determine total income. https://cdn.kastatic.org/ka-youtube-converted/tHYis-DP0oU.mp4/tHYis-DP0oU.mp4 198 Introduction to algebra https://www.khanacademy.org/math/algebra-home/alg-polynomials/alg-introduction-to-polynomials/v/evaluating-a-polynomial-at-a-given-value 2021-06-30T17:32:36Z Evaluating polynomials Evaluating 3x²-8x+7 when x=-2. Sal Khan video https://cdn.kastatic.org/googleusercontent/-05lgM7jKcwmUN1YDV2CvOKqJsIF1DAFifEYcdEGSnLR7B_SnOqzbg2nvv-cunJK16hUx3S3LU2QKeAWdJhIhexw7g Evaluating polynomials Evaluating 3x²-8x+7 when x=-2. https://cdn.kastatic.org/ka-youtube-converted/03yq7XsErqo.mp4/03yq7XsErqo.mp4 69 Introduction to algebra https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:polynomials-and-factorisation/x06d55bfa213a79fd:zeros-of-a-polynomial/e/value-of-a-polynomial 2025-12-30T07:05:15.972746521Z Finding value of a polynomial Finding value of a polynomial ashish exercise https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:substitute-evaluate-expression/v/evaluating-expressions-in-two-variables 2023-05-23T10:28:13.689545116Z Evaluating expressions with two variables Evaluating expressions with multiple variables involves substituting given values for each variable and simplifying the expression. By replacing variables with their corresponding values, we can easily compute the result of expressions, even for more complex examples with multiple terms and operations. Sal Khan video https://cdn.kastatic.org/googleusercontent/iq0X7eHKRMR7hfRc9mv4FyGygVfST6BBHqCNP68H6jRMR_bZ7vvnI1IxdP9ixbNILdvxF4YpfpS7SiGx7vtfzQSx Evaluating expressions with two variables Evaluating expressions with multiple variables involves substituting given values for each variable and simplifying the expression. By replacing variables with their corresponding values, we can easily compute the result of expressions, even for more complex examples with multiple terms and operations. https://cdn.kastatic.org/ka-youtube-converted/S_OX3ByvBSc.mp4/S_OX3ByvBSc.mp4 125 Introduction to algebra https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:substitute-evaluate-expression/a/evaluating-expressions-with-two-variables 2021-06-30T17:51:08Z Evaluating expressions with two variables We've already evaluated expressions with one variable. Now it's time to do it with two variables. article https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:substitute-evaluate-expression/e/evaluating_expressions_2 2026-04-02T16:00:53.810662107Z Evaluating expressions with multiple variables Practice evaluating expressions in two variables by plugging in values for the variables.  Omar Rizwan exercise https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:substitute-evaluate-expression/v/evaluating-expressions-in-two-variables-with-decimals-and-fractions 2023-05-24T15:30:27.32390848Z Evaluating expressions with two variables: fractions & decimals Evaluating expressions with two variables involves substituting the given values for each variable and simplifying the expression. By practicing with examples, we can improve our skills in solving these types of problems, ultimately enhancing our understanding of algebraic expressions and their real-world applications. video https://cdn.kastatic.org/googleusercontent/iWah1gLLRs99FymEfXfnlNID8vYrdrgj5_-fMsHrhiqkLFKMA-ZP-W9iytRuEMtkpGMKwyYOVrWqSscxaWsfl9nzGQ Evaluating expressions with two variables: fractions & decimals Evaluating expressions with two variables involves substituting the given values for each variable and simplifying the expression. By practicing with examples, we can improve our skills in solving these types of problems, ultimately enhancing our understanding of algebraic expressions and their real-world applications. https://cdn.kastatic.org/ka-youtube-converted/GmD7Czmol0k.mp4/GmD7Czmol0k.mp4 207 Introduction to algebra https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:substitute-evaluate-expression/a/evaluating-expressions-with-two-variables-with-fractions-and-decimals 2021-06-30T17:51:06Z Evaluating expressions with two variables: fractions & decimals We've already evaluated expressions with two variables. Now it's time to do it with fractions and decimals. article https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:substitute-evaluate-expression/e/evaluating-expressions-in-two-variables-2 2026-03-10T04:30:37.966653692Z Evaluating expressions with multiple variables: fractions & decimals Practice evaluating expressions in two variables by plugging in values for the variables. These problems include some fractions and decimals. Ben exercise