Question 428063
I am supposed to solve using the substitution method. 
5x-6y=-20
5x+45=y
Here is what I have tried and I think it is wrong.
I switched the 2nd equation so that it read y=5x+45. 
It was then,
5x-6y=-20
y=5x+45
Here is how I worked it out
5x-6(5x+45)=-20
5x-30x-270=-20
-35x-270+270=-20+270 ************** Should be -25x
then x = -10
y = -5