Answer:

y = 3x - 9

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Here m = 3 , thus

y = 3x + c ← is the partial equation

To find c substitute (4, 3) into the partial equation

3 = 12 + c ⇒ c = 3 - 12 = - 9

y = 3x - 9 ← equation of line