# SAT Math Multiple Choice Question 448: Answer and Explanation

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**Question: 448**

**13.** If h is a rational number such that –1 < h < 0, which of the following could be the graph of the equation y = hy + hx + x – 4?

- A.
- B.
- C.
- D.

**Correct Answer:** B

**Explanation:**

B

Difficulty: Hard

Category: Heart of Algebra / Linear Equations

Strategic Advice: None of the variables in the equation has an exponent greater than 1, so the equation is linear. Most of what we know about lines revolves around slope and y-intercepts, so start by rearranging the equation to look like y = mx + b.

Getting to the Answer:

Once rewritten, you have a linear equation with a slope of and a y-intercept of It is given in the question that –1 < h < 0 (or a negative fraction greater than –1), so the quantity h + 1 is positive and the quantity 1 – h is also positive, resulting in a positive slope and a negative y-intercept. Only (B) satisfies these conditions.