help find the rule for function x=-2 y=-21; x=0 y=-9; x=1 y =-3; x=3 y=

what is the rule

x=-2 y=-21

x=0  y=-9

x=1  y =-3
in Algebra 1 Answers by

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1 Answer

First test for linearity. Take two x-y pairs and find the slope.

Slope=(-9-(-21))/(0-(-2))=12/2=6.

Slope=(-3-(-9))/(1-0)=6.

Also (-3-(-21))/(1-(-2))=18/3=6.

We have a linear relation between x and y and we can write y=6x+b and since y=-9 when x=0, b=-9 so the rule is y=6x-9. When x=3, y=9.

by Top Rated User (1.2m points)

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