Question

5x + y = 6
5x + 3y = -4

The y-coordinate of the solution to the system shown is _____.


-5
-1
1/2


got -1

Answer 1

Did you solve the top equation for y? y=6-5x?

Answer 2

Then substitute that into the second equation:
5x + 3(6-5x)=-4

Answer 3

-1 is not correct....

just subtract the 2nd equation from the 1st equation to eliminate x

5x + y = 6
- 5x + 3y = -4
----------------
-2y = 10

y = -5

work out which pronumeral needs to be eliminated before starting the question... and work to that