What's the solution to - 5x-y=21 when y is equal to 6+4x

x = - 3, y=-6

Step-by-step explanation:

In the equation - 5x-y=21, substitute y for 6+4x:

-5x - (6+4x) = 21

^^Solve for x.

X should come out to - 3. To find y, plug - 3 into either equation (-5x-y=21 or y=6+4x) and y should equal - 6.