Test 4 Section 3 Number 19

This one is a great opportunity to practice solving a system of linear equations by elimination. Here are the equations you’re given:

Multiply both sides of the first equation by 2:

Now add that to the original second equation and you’re left with only *y* terms!

From that, you know that *y* = 5. The question asked you for *x*, though, so plug in 5 for *y* in one of the original equations to finish up: