Question

3x - 4y = 7
3x + 2y = -5

When the second equation is subtracted from the first, the resulting equation is _____.


-6y = -12
-6y = 12
-2y = -12
2y = 12

Answer 1

got c

Answer 2

Its
-6y= -12

Answer 3

\[3x-4y=7\]
-
\[3x + 2y = -5\]
Remember everything has an opposite charge if subtracting

\[-3x - 2y = -(-5)\]

So the problem is looks more like this

\[3x-4y=7\]
+
\[-3x - 2y = 5\]

And you get

\[-6y= -12\]