Solve by the substitution method.
--7x + 7y = 21 -5x - 2y = -6
A)(0, 4)
B)No solution
C)(0, 3)
D)(-1, 4)

Name: Solve by the substitution method. --7x + 7y = 21 -5x - 2y = -6 A)(0, 4) B)No solution C)(0, 3) D)(-1, 4)
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Question

Quizplus · Accepted Answer

-7x+7y = 21 can be rewritten as x-y = -3.
Now, using substitution method:
-5x-2y = -6
-5x-2(3-x) = -6
-5x-6+2x = -6
-3x = 0
x = 0
Substituting this value of x in x-y=-3:
0-y=-3
y=3
So, the solution is (0,3), matching with choice C.

Solve by the Substitution Method