Question

solve the system of equations using elimination.
-7x-2y=-13y
x-2y=11

Answer 1

Elimination. Think about common multiples. The most glaring, here, would be the y-coefficients.

How about multiplying the first equation by -1?

Answer 2

why would i multiply it by negative one?

Answer 3

You didn't do it? Very disappointing.

1) All those negatives will be eliminated, making the whole problem prettier.
2) The y will then be easily eliminated. Since we are using "elimination", this is good.