Multiply 2nd equqation by -1 and add to first
5x+4y=22
<u>-3x-4y=-10 +</u>
2x+0y=12
2x=12
divide by 2
x=6
sub back
3x+4y=10
3(6)+4y=10
18+4y=10
minus 18 both sides
4y=-8
divide by 4
y=-2
(x,y)
(6,-2) is solution
Perimeter is adding up all of the sides
the top and bottom are 3 and the left and right 10
so top (3)+ bottom (3)+ left (10)+ right(10)
3+3+10+10= 26
So your answer is c 26units
Answer: $1.07
Step-by-step explanation: When solving this problem the first item that you need to know is that 1 gallon = .264 liters
The calculate the cost per liter you need to multiply the cost per gallon times the decimal value of a liter.
Cost per liter = $4.07 x .264
Cost per liter = $1.07
