Thursday 7 September 2017

FUNCTIONS 2


Find a linear function f(x) with gradient -10 which is such that f(7)=16.

        Solution.

m=-10, points = [7,16] and [x, f(x)]

m = y2-y1/x2-x1

-10 = f(x) – 16/x-7
  
f(x)-16=-10(x-7) [after cross multiply]

f(x)-16=-10x+70

f(x)=-10x+70+16

f(x)=-10x+86

A  linear function is f(x) = -10x+86.

TRY THIS……….


Give out a linear function f(x) with gradient 6 and f(8)=-4

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