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Question

The given table shows a linear relationship between the total number of wooden legs and the chairs in a dining table set

If a particular dining table set has 12 chairs, then how many legs will this set have?


A
48
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B
40
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C
52
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D
56
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Solution

The correct option is C 52
Given:
The table shows a linear relationship between the total number of wooden legs and the chairs. Let’s first construct the equation in the slope-intercept form, and then solve the equation by substituting the number of chairs to be 12.

To find the equation in the slope-intercept form (y=mx+b), let’s first find the slope by considering the following two points: (2, 12) and (3, 16)
Slope m=Change in yChange in x=161232=41=4
Slope m = 4 .
Equation: y=4x+b
Now, let’s substitute the point (2, 12) in the equation to get the y-intercept.
12=4(2)+b
12=8+b
b=4
Therefore, the equation of the line is: y=4x+4
Now, the question asks what will be the number of legs (y) if the number of chairs (x) are12.
So, x=12
y=4(12)+4=48+4=52
Option C is correct.

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