y=-2x+5
6x+3y=15
-6x -6x
3y=15-6x
divide the whole thing by 3
y=5-2x
so then the two equations are now
y=-2x+15 and y=5-2x
-2x+15=5-2x
+2x +2x
15=5 - there is no solution for number 22
I don't know really know how to do 23
24 is a negative relationship