Question

solve using the elimination method -7x - y=-30

Answer 1

you have two unknowns here: x and y
to use the elimination method you therefore need two equations.
you have only specified one equation.

Answer 2

4x + y =21

Answer 3

Sorry

Answer 4

We need one more equ.
for using elimination meth.

Answer 5

so the two equations you have are:

-7x - y = -30
4x + y = 21

Answer 6

can you see that if you add these two equations, then the terms involving y will be eliminated?

Answer 7

Yes I think so...

Answer 8

so what do you get if you add these two equations?

Answer 9

we do that for eliminating +y and -y

Answer 10

@warsop87 please ask questions if you do not understand any specific point.

Answer 11

I got -30

Answer 12

I think im doing this all wrong