SOLUTION: Solve the following systems by substitution. Substitute the expression in the second equation into the first equation and solve. (If the system has no solution, enter NONE for each

SOLUTION: Solve the following systems by substitution. Substitute the expression in the second equation into the first equation and solve. (If the system has no solution, enter NONE for each

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Question 362322: Solve the following systems by substitution. Substitute the expression in the second equation into the first equation and solve. (If the system has no solution, enter NONE for each answer.)
x-y= -4
y= 3x+6

Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Replace y in the 1st equation by 3x+6 (from the bottom equation):
x - (3x+6) = -4,
x - 3x-6 = -4,
-2x = 2,
x = -1. Then y = 3*-1 + 6 = -3+6 = 3.
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