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# Writing expressions with variables

CCSS.Math:

## Video transcript

what I want to do in this video is write the algebraic expressions that represent the same thing that these statements are saying so this first statement they say the sum of negative 7 and the quantity 8 times X so the sum the sum so we're going to have an addition here of negative 7 of negative 7 and the quantity 8 times X so the quantity 8 times X well that's just 8x so I can just write 8x over there so it is negative 7 plus 8x or you could view this as the sum of negative 7 and the quantity 8 times X let's do the next one take the quantity negative 3 times X so take the quantity negative 3 times X and then add 1 and then add 1 so the quantity negative 3 times X we can write that as negative 3x and then we need to add 1 to that so that's going to be plus plus 1 now this one negative 6 plus negative 6 plus so we can write negative 6 plus something the product of negative 1 and X so the product of negative 1 and X that's just going to be negative 1 X negative 1 X which is the same thing as negative x so we can write this as negative 6 plus negative X or we can just write this this is the exact same thing as negative 6 negative 6 minus X and we are done