Because the lines are parallel, they have the same slope.
Therefore, substitute the given (x, y) coordinate into the equation for a line with the same slope as the equation above.
Now solve for b and rewrite the equation with x and y substituted back into their original positions.
Make a slope triangle and find the differences in x values and y values to find the length of the legs of the triangle.
Use the values to find the slope.
Substitute one of the coordinates into the equation of a line, where m = −3, to solve for b.
Rewrite the equation with x and y substituted back into their original positions.