Ok I need help with these two math questions? please..thank you?

Question

solve for y without substitution:

9y - 6xy = 30

and

y - 2xy = 15

thank you!

Answer 1

9y - 6xy = 30

y - 2xy = 15

.......9y - 6xy =  30

(+) -3y + 6xy = -45 [<-- multiplied "y - 2xy = 15" by -3 to get the add. inv. of -6xy]

--------------------------------

.......6y + 0xy = -15

6y = -15

y= -5/2

Answer 2

9y + 6xy = 30

factor out y from the left side

y(9 + 6x) = 30

divide both sides by (9 + 6x) to isolate the y on the left side

y = 30/(9 + 6x)

y - 2xy = 15

factor out y from the left side

y(1 - 2x) = 15

divide both sides by (1 - 2x) to isolate the y on the left side

y = 15/(1 - 2x)