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Question

If the slope of the line that passes through the points (a,0) and (1,−2) is 12, what is the value of a?

A
5
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B
4
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C
3
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D
6
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Solution

The correct option is A 5
Slope of the line passing through the points (a,0) and (1,2) is (0+2)(a1)=2(a1).
Given that the slope of line is 12 which is equal to 2(a1).
Therefore 2(a1)=12. which implies a1=4.
So, a=5

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