3x - y = 23 (1)
2x + 3y = 8 (2)
Multiply all terms in (1) by 3
9x - 3y = 69 (3)
Now there are the same number of y's in equation (3) as in equation (2), so add equation (2) to equation (3) term by term:
11 x = 77
so x = 11
Plug this back into equation (1)
3*11 - y = 23 or 33 - y = 23
Subtract 23 from both sides
10 - y = 0
Add y to both sides
10 = y (or y = 10)
.
3x - y = 23 (1)
2x + 3y = 8 (2)
Multiply all terms in (1) by 3
9x - 3y = 69 (3)
Now there are the same number of y's in equation (3) as in equation (2), so add equation (2) to equation (3) term by term:
11 x = 77
so x = 11
Plug this back into equation (1)
3*11 - y = 23 or 33 - y = 23
Subtract 23 from both sides
10 - y = 0
Add y to both sides
10 = y (or y = 10)
.