If you mean: y = 3x+4 then the slope is 3 and the y intercept is 4
If you mean: y = 3x-4 then it is a straight line equation whose slope is 3 and its y intercept is -4
4
Without any equality signs and a missing plus or minus sign the given expressions can't be solved as in an equation.
3x1/5
This equation is incomplete, and to solve for two variables, you need two equations. So there is no "answer" for this.
If you mean: y = 3x+4 then the slope is 3 and the y intercept is 4
If you mean: y = 3x-4 then it is a straight line equation whose slope is 3 and its y intercept is -4
There can be no solution because there is just an expression - no equation nor inequality.
4
5
Without any equality signs and a missing plus or minus sign the given expressions can't be solved as in an equation.
If you mean: y=3x-4 and the point (2, 1) then the perpendicular equation is 3y=-x+5
Y=5
3x1/5
9
Without any equality signs the given terms can't be considered to be equations and so therefore there are no solutions.