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Using the information that the line passes through the points  (0, 0)  and  (-4, 3) ,  we can find the slope.

slope  =  $\frac{\text{rise}}{\text{run}}\ =\ \frac{y_2-y_1}{x_2-x_1}\ =\ \frac{3-0}{-4-0}\ =\ -\frac34$

Using the point  (0, 0)  and the slope  -$\frac34$ ,  the equation of the line in point-slope form is

y - 0  =  -$\frac34$(x - 0)

Simplify both sides of the equation to get

y  =  -$\frac34$x