Answer:
HJ = 13
JK = 5
Explanation:
You need to draw the line first to understand it: H--J--K
so HJ + JK = HK or KH
(2x + 5) + (3x - 7) = 18
2x + 3x + 5 - 7 = 18
5x - 2 = 18
5x = 20
x = 4
HJ = 2x + 5 = 2(4) + 5 = 8 + 5 = 13
JK = 3x - 7 = 3(4) - 7 = 12 - 7 = 5