Question 145018
4x+6y=26 
-6x-9y=-39

4x+6y = 26
6y = -4x + 26
y = -(2/3)x + 13/3
m = -2/3
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-6x-9y = -39
2x + 3y = 13
3y = -2x + 13
y = -(2/3)x +13/3

This is the same equation with a scalar multiplier. The 2nd eqn is 1.5 times the first, so no explicit solution is possible.
There are an infinite number of combinations of x and y that satisfy the eqn, any point on the line that represents the eqn.