I have the equations 8x + 3y = 20.50 and 4x + 5y = 22.50

How do I solve for x and y?

8x + 3y = 20.50

-

4x+5y=22.50

=

4x-2y=-2, so you have to divide each number by 2, then

2x-y=-1, so

-y=-1-2x / - 1, y=1+2x, then replace it with one original equation like the first one for instance:

8x+3 (1+2x) = 20.50, then

8x+3+6x=20.50, then

14x=20.50-3

14x=17.5

x=1.25, then solve y:/

y=1+2 * (1.25)

y=1+2.5

y=3.5,

So answer is x=1.25, and y=3.5