What is the equation of a line , in general form , the passing through points (1,-2) and has a slope of 1/3

Since you got the slope and point, you first begin with point-slope form.
Point = (1, -2)
Slope = 1/3

y - y1 = m(x - x1)
y + 2 = 1/3(x - 1)
y + 2 = 1/3x - 1/3
y = 1/3x - 7/3

y = 1/3x - 7/3 is the general equation of the line

There is no graph but what i can say is that 1 is the slope and that -2 is the y- intercept