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# Linear inequality word problems — Basic example

Watch Sal work through a basic Linear inequality word problem.

## Want to join the conversation?

• why I can't understand. I mad or what
• you mustbe old now :)
• Why does it have to be next to the .8 to multiply, why can't you just combine it inside the parentheses?
• Because if you have in the equation 0.8(d + 1.2), it does NOT equal 0.8d + 1.2 because of the distributive property. Instead it would equal 0.8d + 0.8*1.2
• At the end, it said that you can just 'cut to the chase,' as Sal worded it; but sometimes that can be inaccurate and the answer was extremely similar. Why would he recommend a method that's so risky, even if it is more efficient?
• If you have time, don't 'cut to the chase', however, if you don't, 'cutting to the chase' is probably your best bet.
• Hey, I don't know if it was just me, but the wording for the question when saying "d represents the number of donuts Ayumi would need to buy to pay for 1 orange juice and the donuts using a debit card" seemed a bit off and confusing for me because it felt like the question was saying d represented both. Is the SATs wording normally like that and am I wrong to think the sentencing was kind of weird. Thanks for video, just curious about the question.
• The keyword is 1 orange juice. Ayumi only wants to buy one orange juice and enough donuts to bring her total either above or equal to 4
• Why can't answer be 0.8d+1.2>4? I know the ques says that Ayumi needs to buy stuff of \$4 or more but if you think more wisely the if \$1.2 is subtracted from \$4 then we get \$2.8 and if Ayumi buys 3 donuts then the cost becomes \$2.4(or \$3.6 if the cost of juice is added) then the cost will be less than \$4. So Ayumi has to buy 4 donuts or more for paying through debit card. Then the final cost would be not less than \$4.2. So the final cost can never be equal to \$4 if Ayumi buys a bottle of orange juice and the cost of donut remains constant
• The whole point is to make an equation that makes sense with what the question says. It says "equal to 4 or higher", so we just go with that. This equation might not apply for donuts and oranges, but it could apply for other products or situations. Just take what the question says and don't think about its answer.
• Hey, I don't know if it was just me, but the wording for the question when saying "d represents the number of donuts Ayumi would need to buy to pay for 1 orange juice and the donuts using a debit card" seemed a bit off and confusing for me because it felt like the question was saying d represented both. Is the SATs wording normally like that and am I wrong to think the sentencing was kind of weird. Thanks for video, just curious about the question.
• I'm preparing for the PSAT and he just ends the video...