Answer:
Step-by-step explanation:
In a rectangle, diagonals are congruent
MK = JL
7x - 40 = 2x + 5 {Add 40 to both sides}
7x - 40 + 40 = 2x + 5 +40
7x = 2x + 45 {Subtract 2x form both sides}
7x - 2x = 2x - 2x + 45
5x = 45 {Divide both sides}
5x/5 = 45/5
x = 9
MK = 7x - 40
= 7*9 - 40
= 63 - 40
MK = 23
