First solve for one variable
solve for a in second eqatn
minus 3x both sides
a=17-3x
sub 17-3x for a in first equaiton
2(17-3x)+2x=18
34-6x+2x=18
34-4x=18
minus 34 both sides
-4x=-16
divide both sides by -4
x=4
sub back
a=17-3x
a=17-3(4)
a=17-12
a=5
a is 5
x=4
WORK SECTION (without thoughts)
2a+2x=18 to a+x=9
a+3x=17
a=17-3x
(17-3x)+x=9
17-2x=9
-2x=-8
x=4
a=17-3(4)
a=17-12
a=5
x=4
a=5
So
8 ounce=1 cup
2 cups=1pint
2 pints=1 quart
4 quarts=1 gallon
128 ounces in 1 gallon
so she needs to get 10 times 20 ounces (200 oz) so
she will need to purchase (200/128) 1.5625 gallons
normally you cannot purchase a fraction of a gallon so she sill have to purchase 2 gallons
I hope this helps you
Circumference = 2 .pi.r
Circumference = 2.pi.8
Circumference =16.pi
Step-by-step explanation:
Answer C. I'm not elected governor,and I didn't remove all tolls