21 cups/ 4.2L per cup =5 L total
Hope this helps!!
X + y = 1
x + 3y = 9
Subtract the second equation from the first.
-2y = -8
divide both sides by -2
y = 4
Plug 4 back into either equation and solve for x.
x + y = 1
x + 4 = 1
subtract 4 from each side
x = -3
(-3, 4)
266.4 - 8.5 - 24 will give you the answer of 233.9
