Which of the following demonstrates how the 20 is calculated using the combination pattern?

△cde maps to △stu with the transformations (x, y) arrowright (x − 2, y − 2) arrowright (3x, 3y) arrowright (x, −y). if cd = a + 1, de = 2a − 1, st = 2b + 3 and tu = b + 6, find the values of a and b. the value of a is and the value of b is .

Two parallel lines are crossed by a transversal.what is value of x

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.