Take the second equation and flip it around so the y on the left ends up on the right and the 4x on the right ends up on the left. This makes all negatives positive and all positives negative. -4x + 12 = y
Then add the first equation to the second equation 4x +12 = -7y <u>-4x + 12 </u>=<u> y </u> this eliminates the x's <u>24</u> = -<u> 6y</u> then divide by - 6 - 6 - 6 - 4 = y<u>
</u>So if you know that y = negative 4, you can substitute into either equation. I pick the second one because I am a lazy person. -y + 12 = 4 x -(-4) + 12 = 4 x combine your numbers<u> </u> <u> 16 </u> = <u>4 x </u> then divide by 4<u> </u> 4 = x So your solution is: x = 4 and y = -4 or this is also written (4, -4)