You can put this solution on YOUR website! Graph the line with slope -3 passing through the point (-3,4)
Standard form of equation for a straight line: y=mx+b, m=slope, b=y-intercept
For given problem:
y=-3x+b
solving for b using coordinates of given point (-3,4)
4=-3*-3+b
b=-5
equation:
y=-3x-5
see graph below as a visual check