Question

x-y=2 y-3x=-20

Answer 1

Solve for y of x-y=2 first, then substitute that into the equation y-3x=-20

Answer 2

x-y=2
y -3x = -20
add the equations
-2x = -18
x = 9
substitute

9 - y = 2
-y = -7
y = 7

Answer 3

how did you get -2x= -18

Answer 4

put x=2+y in the other eq nd solve