8
Answer: DSet 3: Linear Functions (Intermediate)
Explanation
PROBLEM
If f(x) = -x + 7, find x when f(x) = 0.
If f(x) = -x + 7, find x when f(x) = 0.
A.
1
B.
0
C.
-7
D.✓ Correct
7
Detailed Explanation
Choice D is the best answer. -x + 7 = 0, x = 7
Why others are wrong:
A: 1 is incorrect because it does not satisfy the equation.
B: 0 is incorrect because it does not satisfy the equation.
C: -7 is incorrect because it does not satisfy the equation.