Three points 4

The line passed through three points - see table:

x y
-6 4
-4 3
-2 2

Write line equation in y=mx+b form

Result

f = (Correct answer is: -0.5x+1) Wrong answer

Solution:

f(x)=mx+b   4=(6) m+b 3=4 m+b  b6m=4 b4m=3  b=1 m=12=0.5  f(x)=0.5x+1  f3=0.5 (2)+1=2  f=0.5x+1=12



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