Alright, so we have <span>-9x+6y=-30 </span><span>-12x+9y=-30
Although we might really want to say -9x+6y=-12x+9y, we can't do it that way. We have to get rid of a variable and go from there. Solving for y, we get </span>-9x+6y=-30 Divide both sides by 3 -3x+2y=-10 Add 3x to both sides 2y=-10+3x Divide both sides by 2 y=(-10+3x)/2
-12x+9y=-30 Divide both sides by 3 -4x+3y=-10 Add 4x to both sides -10+4x=3y Divide both sides by 3 (-10+4x)/3=y
Since we have (-10+4x)/3=y and y=(-10+3x)/2 , we have (-10+4x)/3=(-10+3x)/2 Since 3*2=6, we can multiply both sides by 6 -20+8x=-30+9x Add 30 to both sides 10+8x=9x Subtract 8x from both sides x=10 Plug that in to any equation,and you should have your answer! Good luck, and ask if you have any questions!
