jayy1474
23.10.2020 •
Mathematics
Cathy bought a pair of jeans that were on sale for $30.40. the jeans had an original price of $38. which equation down below could be used to find the dollar amount of the discount, y, based on the original price, x?
A. y = 0.2x
B. y = 0.8x
C. y = 1.25x
D. y = 7.6x
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Ответ:
B. y = 0.8x
Step-by-step explanation:Hi there !
$38 100%
$30.4 x%
x = 30.4×100/38 = 3040/100 = 80% = 80/100 = 0.8
y = 0.8x
Good luck !
Ответ:
Work Shown:
2xy+x = 12
2xy+x-x = 12-x ... subtract x from both sides
2xy = 12-x
2xy/2x = (12-x)/(2x) ... divide both sides by 2x to get y all by itself
y = (12-x)/(2x)