You could buy 9 pounds without exceeding your 18 dollar limit. You would solve it buy dividing the 18 by 2 to get your answer
Answer:
The answer is "2x-y=4"
Step-by-step explanation:
Given:

The Formula of Slope:

by replacing the (2,0) and (0,-4) coordinates in the above formula:

if point y intercepting in x then x=0, for this the value of x= 0 and c=-4.
Equation of the line:

apply m and c value in the above equation:

Subtract by 2x on both sides of the equation we get:

Attached the solution and work. The x,y,n are just variables I put in so you could see how I solved for the missing angle.
180-15=165
15x=165
165/15
x=11