The gradient of a line joining x 4 and 1 2 is f... - JAMB Mathematics 2014 Question
The gradient of a line joining (x,4) and (1,2) is (\frac{1}{2}). Find the value of x
A
5
B
3
C
-3
D
-5
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Correct Option: A
(\text{Gradient m} = \frac{y_2 - y_1}{x_2 - x_1})
(\frac{1}{2} = \frac{2 - 4}{1 - x})
1 - x = 2(2 - 4)
1 - x = 4 - 8
1 - x = -4
-x = -4 - 1
x = 5
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