Question

Solve the system.

x - 5y = 4
3x - 4y = 12

Answer 1

x=4+5y is the third equation. Note I will solve this by substitution.

⇒In the place of x in the equation 3x-4y=12 plug in 4+5y

`3(4+5y)-4y=12\\12+15y-4y=12\\12-11y=12\\-11y=12-12\\-11y=0\\(-11y)/(-11)=(0)/(-11) \\ y=0`

x=4+5y

x=4+5(0)

x=4

Attached is the solution.

Goodluck