Assuming you are trying to solve this ....
substitution appears to be the ideal way:
from x-2y =4, x = 2y+4
sub that into the 2nd equation,
2(2y+4) + 5y = 17
4y + 8 + 5y = 17
9y = 9
y = 1
sub that y value into x = 2y+4 to get x
X-2y=4
2x+5y=17
1 answer