Question

solve the following system by any method -3x+5y=-9 and 4x+8y=12

Answer 1

-3x + 5y = -9   │ × 4 
4x + 8y = 12   │ × 3

-12x + 20y = -36
12x + 24y = 36           +
-------------------------------
   / 44y = 0 ⇒ y = 0

4x + 8y = 12     but   y = 0
4x + 0 = 12
4x = 12
x = 12/4
x = 3