6
9
10
Without an equality sign the expression given can't be considered to be an equation.
If you mean y = 4x-6 then the slope is 4 and the y intercept is -6
9
5
9
8
If you mean y = 4x+2 then it is the linear equation of a straight line
If you mean: y = 4x-2 and y = x+13 then x = 5 and y = 18
This is not written in any standard algebraic format, so one can only guess. The y4 might be y4 ? The x might mean variable x or multiplication? Most likely I think it might be 8y4.