Y = 7x-3
Rearrange the equation to make x the subject

Step-by-step explanation:

y = 7x - 3

To make x the subject, you need to isolate it. (Get x by itself)

y = 7x - 3

Add 3 on both sides...

y + 3 = 7x

Divide by 7 (Maybe your teacher wants 7x = y = 3 but if she doesn't and wants x completely by itself here's the answer)

x = y/7 + 3/6

180=144+3X

X=12

Step-by-step explanation:

angles must add to 180

180=45+80+3X+19

gather like terms

180=144+3X

subtract

36=3X

divide

X=12