asked 137k views
5 votes
Use linear equation to solve this.
2x - 3y = 13
x + 2y = -4

2 Answers

3 votes
are they separate questions or are the together?

answered
User Daft
by
8.1k points
3 votes
First: Multiply Equation 2 by -2.

2x - 3y = 13
-2x - 4y = 8

Second: Add the two equations to eliminate your x factor.

-7y = 21

Third: Divide both sides by -7 to isolate x

y = -3

Fourth: Substitute your y value back into one of your prior equations to solve for x.

x + 2(-3) = -4
x - 6 = -4
+ 6 +6
_________
x = 2

x = 2, y = -3

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