Use addition or substitution to find the value of y for this set of equations. top line 4x + 13y = 40 bottom line 4x + 3y = -40

Using the addition method, you could first multiply one equation by -1

then add to eliminate the x variables.

Let's multiply the second equation by -1 to give us:

4x + 13y = 40

-4x + (-3y) = 40

adding gives us

10y = 80

y = 8 (dividing both sides by 8)

If you also needed to find x, you could then substitute

the value of 8 in for y in one of the equations and solve for x.

## Comments

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