### Home > CAAC > Chapter 7 > Lesson 7.3.3 > Problem 7-105

7-105.

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.