16Hit1600
AlgebraVery hardThird point from two intercepts

Algebra practice question

In the xy-plane, a line has x-intercept 4 and y-intercept −2. The point (6, k) lies on the line. What is the value of k?

Answer: 1

Slope = (0 − (−2))/(4 − 0) = 1/2, so y = x/2 − 2. At x = 6, y = 1.

Common wrong answers

If you answered 3
3 forgets the −2.
If you answered 10
10 uses slope 2.
If you answered -1
−1 has the slope's sign wrong.

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