First start by writing th equation y=mx+b then because we know the slope (m) is perpendicular to the other line we can find it. so it would be the negative reciprocal to -13 which is 1/13 then you can use the slope and the x and y point and sub them into the equation to find the b value y=3 x=4 m=1/13 3=1/13*4+b then solve for b 3=4/13+b 3-4/13=b 2.69=b the write out the equation y=1/13x+2.69