Answer:
x = 1/2 or .5
Step-by-step explanation:
JK = 7x + 2, KL = 5x + 4 and JL = 12
JK + KL = JL
Plug in the equations for the Lines
7x + 2 + 5x + 4 = 12
Combine like-terms
12x + 2 + 4 = 12
12x + 6 = 12
Subtract 6 from either side
12x + 6 = 12
-6 -6
12x = 6
Divide either side by 12
12x / 12 = 6/ 12
x= 1/2 or .5
