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Solve each system using the substitution method 6x-y=-4 and 2x+2y=15

Solve each system using the substitution method 6x-y=-4 and 2x+2y=15
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5 votes
Solve each system using the substitution method 6x-y=-4 and 2x+2y=15

User Andrei Filonov
by
8.5k points

1 Answer

6 votes
Convert 6x - y = -4 into y = mx + b
Y - 4 = 6x
Y = 6x + 4
Substitute that into second equation
2x + 2(6x + 4) = 15
2x + 12x + 8 = 15
14x = 7
X = 1/2
6(1/2) - y = -4
3 - y = -4
-y = -7, y = 7
Final answer: x = 1/2, y = 7
User Pylanglois
by
8.3k points
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