Mathematics
ddevil135
15

A direct variation function contains the points (–9, –3) and (–12, –4). Which equation represents the function? y = –3x y = – x/3 y = x/3 y = 3x

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(2) Answers
Lynwood559

First, find the slope between the two points.  Slope = y2-y1 / x2-x1 -4+3/ -12+9 -1/-3 1/3 is the slope of this equation.  You do not have to go any further to find b or the y-intercept because it appears that b or the y-intercept is 0 in this case.  y= 1/3x or in other words y= x/3

Ramelize587

(-9,-3)  (-12,-4)   use y2-y1/x2-x1=slope,   (-4+3)/(-12+9)=1/3    y=x/3

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