Answer:
The sum of x and y is 8.
Step-by-step explanation:
x+2y=10
x-2y=2
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2x = 12, so x = 6. Substituting 6 for x in the 2nd equation, we get:
6 - 2y = 2, or
4 = 2y, or y = 2. The solution is therefore (6, 2).
The sum of x and y is 6 + 2 = 8 (answer)
I solved it on paper so it's easier.
But good luck ! :)
Answer:

Step-by-step explanation:
I believe this is the correct answer. In order to check that my equations are correct I put in some dummy numbers.
a= 2
b=4
c= 
This is how you would write the statement:

You could also write it like this, if the one-half applies to everything:
The circumference of a circle with a diameter of 30 centimeters is 94.25 cm
I hope this helped! : )