Question

Solve the system by substitution?
-4.5X-2Y=-12.5
3.25X-Y=-0.75

Answer 1

multiply by 2 to the second equation and subtract the equations

Answer 2

y=0.75+3025x then substitute into the other equation.

Answer 3

first set up a matrix (2x3)

then apply Gaussian elimination with backward substitution

Answer 4

this is confusing can you show me how to work it out