Question

The sum of two numbers, x and y, is 12. The difference of x and two times y is 6. What are the values of x and y? x = 8, y = 4 x = 10, y = 2 x = 18, y = -6 x = 20, y = -8

Answer 1

X=10 will be a answer

Answer 2

x+y=12
x-2y=6

hmm
multiply 2nd equation by -1 and add to first

-x+2y=-6
x+y=12 +
0x+3y=6

3y=6
y=2
sub back
x+y=12
x+2=12
x=10

x=10, y=2