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3 x + 2 y = 20 3x+2y=20 If x = 3 x=3 in the equation above, what is the value of y ?

Guest Apr 21, 2017
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3x + 2y = 20   x = 3

substitute for x

3(3) + 2y = 20

multiply

9 + 2y = 20

subtract on both sides.

(9 - 9) + 2y = (20 - 9)

simplify

2y = 11

divide bothe sides by 2

2y/2 = 11/2

Evaluate 11/2 into a mix number

y = 5 1/2

y = five and one half.

Snappingtunic99  Apr 21, 2017

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