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# Tutor profile: Heather H.

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Heather H.
Senior Undergraduate at Washington University in St. Louis
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## Questions

### Subject:Pre-Algebra

TutorMe
Question:

x + 7 = 2 Solve for x.

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Heather H.

x + 7 = 2 ---> subtract from each side x = -5

### Subject:ACT

TutorMe
Question:

Bobby gave 20% of his baseball cards to Joe and 15% to Sam. If he still had 520 cards, how many did he originally have?

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Heather H.

We know Bobby gave away 35% of his baseball cards in total. That means he kept 65% of his original cards. We can set up an equation with c representing the number of cards Bobby originally had. c x 0.65 = 520 c = 800 Answer: 800

### Subject:Algebra

TutorMe
Question:

2x + 3y = 7 3x + 2y = 8 Solve for x and y.

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Heather H.

2x + 3y = 7 multiply by 3 ---> 6x + 9y = 21 3x + 2y = 8 multiply by 2 ---> 6x + 4y = 16 (subtract from above equation) ---> 5y = 5 ---> y = 1 plug y = 1 into 2x + 3y = 7 to find x ---> x = 2 Answer: y = 1, x = 2

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