How do you solve by substitution x+14y=84 and 2x-7= -7?

1 Answer
Jul 11, 2015

x=0
y=6

Explanation:

There are a few ways to find x and y.

Well, we could multiply by -2 to both sides of the equal sign of

x+14y=84

to get: -2x-28y=-168

Then, add what we just obtained to 2x-7=-7

2x-7=-7
-2x-28y=-168

which gives us: -7-28y=-175

Add 7 to both sides: -28y=-168

Divide both sides by -28 to get:

y=6

Now that we have y, plug it into x+14y=84

x+14y=84
x+14(6)=84
x+84=84
x=0

So, x=0 and y=6