Athena F. answered • 04/04/20
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Experienced K-Undergrad tutor specializing in math and computers
The easiest method for this problem will be scaling and canceling. To scale, we want to get the coefficients for one variable to be the same in both equations (or one negative and the other positive). So what we can do is multiple the top equation by 7, and the bottom equation by 2. That gives:
-14x-49y=210
14x+8y=36
Now we can add them together, since 14x and -14x will cancel out as is. That gives
-41y=246
From there, you can solve for y, then plug why back in to either equation and solve for x!
