ISEE Word Problems Question 258: Answer and Explanation
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Question: 258
7. The chart shows the inputs and outputs at a factory.
| Inputs | Outputs |
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 8 |
| · | · |
| · | · |
| · | · |
| x | y |
If the pattern shown is continued, then what is the value of y?
- A. 2(x – 1)
- B. 2x – 1
- C. 2x + 1
- D. 2(x + 1)
Correct Answer: A
Explanation:
A
Plug values from the chart into the answers. Begin with x = 1 and y = 0. Choices (A) and (B) both work, but choices (C) and (D) do not. Now test x = 2 and y = 2. Choice (A) still works, and choice (B) does not.