It wouldn't let me post the answer. See images for the answer and explanation
First you do -13+9. That equals -4.
Then bring down -c=-4 because there is a 1 in front of the c so -1c.
Next divide both sides by -1. The -c side cancels out so then your left with -4/-1.
That equals positive 4.
C=4
That’s ur answer.

Therefore, the answer is 1) y = 2x - 6