Here is your system of equations:
200x + 400y = 3200
y = 2x
Now plug into your calculator to see the graph.
Where the lines cross each other is the point that shows the solution.
9 + 9 = 18
42 - 18 = 24
24 / 2 = 12
the length is 12 inches
This you answer x=-1/5y+-4/5
http://www.mathpapa.com/algebra-calculator.html
Answer:
Total buy (without taxes) = 30 + 35 = 65 $
Taxes = 6%(35) = 2.1 $
Total Buy with Taxes = 65 +2.1 = 67.1 $
A: 67 dollars and 10 cents