Question

-3x-y=8 7x+y=-12 linear system using elimination .

Answer 1

-3x-y=8
7x+y=-12
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So you have to solve this by elimination. Can you sum them?

Answer 2

4x =-4
which becomes -1x

then -3(-1)-y=8
Which is ? 5?

Answer 3

So you found x = -1 and did -3(-1)-y=8, which is the same as 3-y=8 => -y = 8 - 3 => -y=5. It gives us y=-5.

Answer 4

Thanks . So when x is negative , the y would become negative also ?

Answer 5

It depends on the equation. Sometimes yes, sometimes nope.

Answer 6

Oh okay.