Question

Which graph shows the solution to the following inequally!
-2r + 3 > 19

Answer 1

The answer is 4th diagram, as r < -8 so it is an open dot at -8

Explanation:

First, move all the unknown value to one side :

-2r + 3 > 19

-2r > 19 - 3

-2r > 16

Second, solve it to find the value of r :

-2r > 16

r < -8 (when divided or multiplied by a -ve no. , need to change the symbol)

● means greater / smaller / equals to a no. (closed dot)

○ means greater / smaller to a no. (open dot)