Question

solve the system by substitution
-4.5x - 2y = -12.5
3.25x - y = -0.75

Answer 1

Solve for a variable in either equation. The second one looks easiest to solve for y.

3.25x - y = -0.75
-y = -3.25x - 0.75
y = 3.25x + 0.75

Using this, we know what y equals. We can substitute this value in for y in the first equation.

-4.5x - 2y = -12.5
-4.5x - 2(3.25x + 0.75) = -12.5

Now, you can solve for x using normal algebra. Once you do, you can use the equation you got for y earlier and plug in the x value. (y = 3.25x + 0.75)

Answer 2

thank you