DF = 8x - 12
FH = x + 3
FH = ½DF
DF = 2FH
DF = 8x - 12
FH = 2x + 6
8x - 12 = 2x + 6
8x - 2x = 6 + 12
6x = 18
x = 3
You asked:
Solve the system of equations:\[\begin{aligned}D F &= 8 x - 12\\F H &= x + 3\\F H &= \frac{1}{2} D F\\D F &= 2 F H\\D F &= 8 x - 12\\F H &= 2 x + 6\\8 x - 12 &= 2 x + 6\\8 x - 2 x &= 6 + 12\\6 x &= 18\\x &= 3\end{aligned}\]