13. linear functions alwasys have x^1 as highest exonent for placeholder we see that in D, we have 6x^2 which is quadratic, not linear
D is ansre
15. isolate y emember you can do anything to an equaiton as long as you do it to both sides
12x-4y=20 add 4y to both sides 12x+4y-4y=20+4y 12x+0=4y+20 12x=4y+20 minus 20 both sides 12x-20=4y+20-20 12x-20=4y+0 12x-20=4y divide both sides by 4 12/4x-20/4=4/4y 3x-5=1y 3x-5=y y=3x-5 why is it not listed, there is an error in the question, report the erre
