In a set of three lines, a pair of parallel lines is intersected by a transversal. the intersection forms eight special angles. two of the special angles, a and b, are corresponding angles. for the set of parallel lines intersected by a transversal, a=4x and b=-5(x-18). part a: write an equation to represent the corresponding relationship between a and b. part b: use the equation to find the measures of a and b.