Final answer:
To find r, substitute the given equations into each other and solve.
Step-by-step explanation:
To find r, we need to use the given equations.
First, we have:
m / HGF = 12x - 8
Next, we have:
mZHPG = 3x + 14
And finally:
m2PGF = 68
To solve for r, we can substitute the values from the equations into each other and solve for r.