First, you have to get y be itself. Divide the other side of the equation by 5. Your new equation is y=26-13/5x. Now, to put it in slope intercept form which is y=mx+b, you will want to switch the mx and the b to their correct positions. Your new equation is y=-13/5x+26. Slope is represented by. The m in this equation is -13/5, and therefore, slope is equal to -13/5.