Question

Solve the system by substitution.
-4.5x-2y=-12.5
3.25x-y=-0.75
Please help my step by step so I can really understand, I'm super confused!

Answer 1

Isolate y in the second equation to get

y = 3.25x + 0.75

Answer 2

Then substitute the expression for y in place of y in the first equation:

I'd also multiply the first equation by 10 to make things easier:

-45x -20y = -125
-45x - 20(3.25x + 0.75) = -125

Answer 3

I know you may be uncomfortable with decimals, but there is not always a way to avoid them completely.

Answer 4

This is one of those cases.

Answer 5

so multiply like this? (10)-45x- (10)-20y= (10)-125

Answer 6

@Hero