Use the elimination method to the solve the following system of equation.?

[Hank]

a) y=3x-1
x-2y+2=0

b) x+2y+4=0
x-y=4

[Cherukuri]

x=4/5 y=7/5 and x=4/3 y=-8/3

[como]

a)
3x - y = 1
x - 2y = - 2

3x - y = 1
-3x + 6y = 6_____ADD

5y = 7
y = 7/5

x - 14/5 = - 2
x = 4/5

x = 4/5 , y = 7/5

b)
x + 2y = - 4
-x + y = - 4______ADD

3y = - 8
y = - 8/3

x - 16/3 = - 4
x = 4/3

x = 4/3 , y = - 8/3