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evablogger [386]
3 years ago
13

Which of the following is an example of a function?

Mathematics
1 answer:
Leokris [45]3 years ago
4 0
A. Not a function since we have the points (-1,0) and (-1,3). The x value repeats while the y values are different. Plugging in x = -1 leads to multiple outputs, which shows we don't have a function. To get a better visual, you can plot the points. You'll see that the points form a vertical line. Therefore, this graph fails the vertical line test. 

B. This is a function. All of the x values are different. The points, when graphed, pass the vertical line test. In other words, its impossible to draw a vertical line through any two points on the graph. Any x input here leads to exactly one y output.

C. This is not a function. Like choice A, we have repeated x values. In this case we have (4,6) and (4,7). The x value x = 4 repeats itself leading to multiple outputs y = 6 and y = 7

D. This is also not a function. The x value x = 0 repeats itself. The graph fails the vertical line test.

--------------------------------

Answer: Choice B

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Hi there,

Your question is "twice a number (x) is fifty"

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If you're looking to solve this equation, it's often best to think about the "reverse" of the current equation.

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To isolate x, divide that side by 2.

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