Final answer:
To find the value of EF, use the equation EF + FG = EG and solve for x. Then substitute the value of x back into the equation to find EF. EF = 9.
Step-by-step explanation:
Given that points E, F, and G are collinear and F lies between E and G, we can write the equation EF + FG = EG.
Substituting the given values: 4x - 15 + 5x + 7 = 46.
Combining like terms and solving for x: 9x - 8 = 46.
Adding 8 to both sides: 9x = 54.
Dividing both sides by 9: x = 6.
Now we can find the value of EF by substituting x back into the equation: EF = 4(6) - 15
= 24 - 15
= 9.