If xx and y vary directly and y is 21 when x is 7, find y when x is 5
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Answer:
133 pieces.
Step-by-step explanation:
If 7 pieces of cardstock sell for $3, we can set up a proportion to determine the amount of pieces bought in pieces/ money spent:
Cross multiply:
7 · 57 = 3 · x
399 = 3x
Divide both sides by 3:
x = 133 pieces. This is the amount of pieces bought.