Write an equation that relates the angle in a triangle. the measure of angle a is 45 degrees. the measure of angle b is b degrees. the measure of angle c is 3b degrees.

Since the interior angles of a triangle equal 180°, then 180-45=135.

Then you would use 135 to find the remaining two angles: b+3b=135.
4b=135.

Divide to find b. And the plug in whatever b is for the to figure out Angles B and C.

However, I believe the equation it's looking for is: 180=45+b+3b OR 45+4b=180