Question 5 Answer & Explanation - SAT Algebra

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algebra

A line has slope $k$ and x-intercept $k$ . What is its y-intercept?

$-k^2$

$k^2$

$k$

$-k$

Correct Answer: A

Choice A is the correct answer. Use point-slope.

Point: $(k, 0)$ .
Slope: $k$ .
Equation: $y - 0 = k(x - k) \rightarrow y = kx - k^2$ .
Y-intercept: The constant term is $-k^2$ .

💡 Strategic Tip: Substitute $x=0$ into the equation.

Choice B is incorrect.Choice C is incorrect.Choice D is incorrect.

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