Respuesta :

Remark
JK is going to be twice LM
Find x first.
Solve for LM
JK = 2 * LM

Equation
3x + 4 = 7x         Subtract 3x from both sides.
4 = 7x - 3x          
4 = 4x                 Divide by 4
4x/4 = 4/4
x = 1

Solve for LM
LM = 2x + 6
LM = 2(1) + 6
LM = 2 + 6
LM = 8

Find JK
JK = 2*LM
JK = 2 * 8
JK = 16

Question why is JK = 2 * LM?

D <<<< Answer