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find equation of linear function

y = 3 - 2x

Step-by-step explanation:

The function y = f(x) passes through the points (1,1) and (2,-1).

So, any two known points satisfying a linear function are sufficient to determine the function equation.

From the two points form of straight line we can write,

⇒ y - 1 = 2(1 - x)

⇒ y - 1 = 2 - 2x

⇒ y = 3 - 2x  

Therefore, this is the equation of the linear function. (Answer)

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