The total cost of ordering 10 shirts can be calculated as following:
C = 4 + 12(10)
C = 4 + 120
C = 124
Y = 3x - 4 . . . (1)
9x - 3y = 14 . .(2)
Putting (1) into (2) gives
9x - 3(3x - 4) = 14
9x - 9x + 12 = 14
12 = 14
Therefore, there is no solution.
6 - 2x = 18
2x = - 12
x = - 6
Contrary to someone's interpretation, given the information provided, solving for b consists of:
a+b+c=180 subtract a from both sides
b+c=180-a, subtract c from both sides
b=180-a-c
B
On the B graphs the two lines intersect at (4,1) making it the solution
