The coordinate of point J on the number line is -9
The given parameters are
JK = KL
K = 7
L = 23
The above means that:
K = 1/2 * (J + L)
So, we have
7 = 1/2 * (J + 23)
Multiply both sides by 2
14 = J + 23
Subtract 23 from both sides of the equation
J = -9
Hence, the coordinate of point J on the number line is -9
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