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7

Set 2: Linear Functions (Advanced)

Explanation

Answer: C

PROBLEM

Two lines: y = 2x + 1 and y = -x + 7. Find intersection x.

Two lines: y = 2x + 1 and y = -x + 7. Find intersection x.

A.

3

B.

1

C.

2

✓ Correct
D.

5

Detailed Explanation

Choice C is the best answer. 2x + 1 = -x + 7. 3x = 6, x = 2

Why others are wrong:
A: 3 is incorrect because it does not satisfy the equation.
B: 1 is incorrect because it does not satisfy the equation.
D: 5 is incorrect because it does not satisfy the equation.
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