Let's make an equation. T will be the number.
(T+5)/4=7
Let's multiply both sides by 4 to get T by itself.
T+5=28
Subtract 5 from both sides.
T=23
Your number is 23.
Every point on the line 3/7x -1 is a solution
Unless there is another line provided...
B as you can see the points go upwards as they go across :) Hope this helps!