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14-09-2016
Mathematics

contestada

Solve the system of equations 2x + 3y = 40 and –2x + 2y = 20.

Respuesta :

14-09-2016

2x + 3y = 40
+
-2x + 2y = 20
___________ Adding both equations

0x + 5y = 60
____________

5y = 60
y = 60/5 = 12

y = 12.

Since we have gotten y =12, and the only option with that is option D.

So we don't have to solve for x.

The answer is D.

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