Answer: b. 22
Step-by-step explanation:
The slope of a line passing through two points A(a,b) and B(c,d) is given by:_
[tex]m=\dfrac{d-b}{c-a}[/tex]
Let the missing coordinate of point R be y.
Then , the slope of the line passing through the points R(0,y) and (-4,2) will be :_
[tex]5=\dfrac{2-y}{-4-0}\\\\\Rightarrow\ 5=\dfrac{2-y}{-4}\\\\\Rightarrow\ -4\times5=2-y\\\\\Rightarrow\ y=2+20=22[/tex]
Hence, the missing coordinate of point R is y= 22
