How do you solve #y-2x=3# and #2x-3y=21# using substitution?
Start by writing one of these 2 equations in terms of
I'm going to start with getting
Now that we have the equation in terms of
Notice that now we have one equation with one variable. This means we can go ahead and solve for
Adding 9 to both sides,
Now that we have a value for
Subtracting 15 from both sides and this solving for y,