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OLEGan [10]
3 years ago
7

If y varies directly as x, and y=21 when x=9, find x when y=52.5

Mathematics
2 answers:
Aleksandr [31]3 years ago
8 0
21_____9
52.5_____x

X:52.5 * 9 / 22.5
X: 472.5/21
X: 22.5
AnnyKZ [126]3 years ago
3 0
When y=21 and x=9
21/9
which means that to go from x to y, you multiply x by 2.33
2.33x=y

2.33x=52.5
divide both sides by 2.33
x=22.53 (when rounded) 

so when y=52.5, x=22.53
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