9. Georgina and her mom want to put fencing around their rectangular vegetable garden. The length
of their garden is 45 feet long and the width is 2f + 5 feet long.
How much fencing is needed?

First, work out the equation of the graph.
Equation of a straight line graph is given in the form  where  is the slope of the line and  is the y-intercept.

The graph given shows the line intercept y-axis at (0, -1)

To work out the slope, choose any two coordinates then find their vertical and horizontal distance. Say we choose (0, -1) and (3, 0)
The vertical distance is 1 and the horizontal distance is 3, so the slope is
 

Then form the equation for the line

→ Multiply each term by 3


Now the inequality part, the shaded region is above the line, so the values intended are 'greater than' and the line is a bold line, so the inequality is 'greater than or equal to' and the symbol is ≥

The inequality is then
3y ≥ x - 3

Note: None of the options show this answer. Maybe check if the original options have been copied correctly.