point R=(6,4), Q=(4,3), and P=(-2,b) and are collinear. what is the value of b?
a) 0
b) 1
c) 2
d) 3

Question

point R=(6,4), Q=(4,3), and P=(-2,b) and are collinear. what is the value of b?
a) 0
b) 1
c) 2 
d) 3

campbell_st · Answer

collinear means all the points are on the same line

so find the equation of the line using the points 

R(6,4) and Q (4, 3) 

when you get the equation 

use the 3rd point P(-2, b) by substituting x = -2 into the equation to find y

the value of y, will be b. 

An alternate solution is to plot the 2 points on the number plane, draw a line through them and see what the y value is when x = -2

hope it helps