Set 6: Linear Functions (Intermediate)

Explanation

Answer: A

Find the x-intercept of $y = 3x - 12$ .

$4$

✓ Correct

$-12$

$-4$

$12$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Set $y=0$ . 1. Substitute: $0= 3 x - 12$ . 2. Add 12: $12= 3 x$ . 3. Divide: $x = 4$ . Strategic Tip: In $y=mx+b$ , x-intercept is $-b/m$ . Choice B is incorrect because y-intercept. Choice C is incorrect because sign error. Choice D is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is $4$

Why others are wrong:

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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