8x+4y=-20 and -4x-8y=-20 solve each system by substitution

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12-04-2016
Mathematics

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8x+4y=-20 and -4x-8y=-20 solve each system by substitution

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benjaminhe benjaminhe · Answer 1 · 2016-04-12T03:00:47+02:00

benjaminhe benjaminhe

12-04-2016

8x + 4y = -20
4y = -20 - 8x
y = -5 -2x

-4x - 8y = -20
-4x - 8(-5-2x) = -20
-4x + 40 + 16x = -20
12x = -60
x = -5

8(-5) + 4y = -20
-40 + 4y = -20
4y = 20
y = 5

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