Solve the system by elimination. . 4x-9y=-21 , -4x-3y=9

Mathematics

1 answer:

Ivan3 years ago

7 0

(-3, 1)
4x-9y=-21
+-4x-3y=9
-12y= -12
y=1

4x- 9(1)= -21
4x-9=-21
+9 +9
4x= -12
x=-3

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