The value of 
.
Solution:
Given equations:
7x + 2y = 57 ---------- (1)
x + 2y = 5 ---------- (2)
Subtract 2y from both sides of the equation (2).
x = 5 – 2y ---------- (3)
Substitute equation (3) in equation (1).
7(5 – 2y) + 2y = 57
35 – 14y + 2y = 57
35 – 12y = 57
Subtract 35 from both sides of the equation.
–12y = 22
Divide by 12 on both sides.
Substitute y value in equation (3).
Hence the value of .
38.98 because you get 15.59 and divide that by 40% you get 38.975 but since you're speaking in money it rounds to 38.98
Well you need to find the y-intercept (the number after the number with the x) and plot that number on the graph. next you need to find the slope (ex. 3x+4 the slope would be 3/1) and then you would plot the rest of the points using the slope. and last you would draw a line through the points.
It would be pi over 6, 5 pi over 6, and 3 pi over 6.
