A school spent exactly 60 on x packs of markers and y packs... | SAT Linear equations in two variables Question, Answer Explained

Question bank / Linear equations in two variables

Math · AlgebraEasy

A school spent exactly $\$60$ on $x$ packs of markers and $y$ packs of paper. The equation $3x + 5y = 60$ represents this situation. If the school bought $6$ packs of paper, how many packs of markers did it buy?

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Answer: 10

Substitute $y = 6$ : $3x + 5(6) = 60$ , so $3x + 30 = 60$ . Then $3x = 30$ and $x = 10$ .

Substituting $6$ for $x$ instead of $y$ gives $y = 8.4$ , which answers a different question.

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