How do you solve -14= -20y - 7 and 10y + 4 = 2x?

1 Answer
Alan P.
Nov 29, 2015

(x,y) = (15/4, 7/20)

Explanation:

Given:
[1]color(white)("XXX")-14=-20y-7
[2]color(white)("XXX")10y+4=2x

Re-arranging [1] to solve for y
[3]color(white)("XXX")20y = 7
[4]color(white)("XXX")y = 7/20

Substituting 7/20 (from [4]) for y in [2]
[5]color(white)("XXX")10*(7/20)+4 = 2x

[6]color(white)("XXX")7/2+8/2 = 2x

[7]color(white)("XXX")x= 15/4

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