Question

-3x+4y=26 solve for xy

Answer 1

can you make y be by itself? bring everything except the y to one side?

Answer 2

y=3x/4+13/2
x=4y/3-26/3

Answer 3

so, if you know what y =... you now can plug that into the second equation! (put it in parenthesis so you keep with proper math rules)
everywhere you see y, plug 3x/4+13/2 in!

Answer 4

that leaves you with only one variable, which you can solve for! when you get a final answer for what x actually equals, you can then replug that back into your original equation to find y!