Friday, 4 November 2016

FUNCTIONS 2


Find a linear function f(x) with gradient -7 which is such that f(5)=12.

        Solution.

m=-7, points = [5,12] and [x, f(x)]

m = y2-y1/x2-x1

-7 = f(x) – 12/x-5


f(x)-12=-7(x-5) [after cross multiply]
f(x)-12=-7x+35
f(x)=-10x+35+12
f(x)=-10x+47

Hence a  linear function is f(x) = -10x+47.

TRY THIS……….

Give out a linear function f(x) with Gradient 8 and f(4)=14

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