Point I is on line segment start overline, H, J, end overline
HJ
. Given H, I, equals, x, commaHI=x, I, J, equals, 2, x, plus, 9, commaIJ=2x+9, and H, J, equals, 4, x, commaHJ=4x, determine the numerical length of start overline, I, J, end overline, .
IJ