18x+4y=-10
9x-7y=-23
solve it a number of ways, I will do determinates.
Det=-18*7-36= -162
x= 70+92 / det= 162/-162=-1
y=-18*23+90 /det= -324/-162=2
9x-7y=-23
Det=-18*7-36= -162
x= 70+92 / det= 162/-162=-1
y=-18*23+90 /det= -324/-162=2