algebra

Question #1
The price of 7 citrons and 10 fragrant wood apples is 88 units. The price of 10 citrons and 7 fragrant wood apples is 82 units. Find the price of a citron and the price of a wood apple.

I used 17x=170??????

Question #2

\$6300 is invested, part of it at 12% and part of it at 9%. For a certain year, the total yield is \$660.00. How much was invested at each rate?

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1. #1
x=price of citrons
y=price of fragrant
7x+10y=88
10x+7y=82

70x+100y=880
-
70x+49y=574
51y=306
y=6
x=4

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2. Problem: \$6300 is invested, part of it at 12% and part of it at 9%. For a certain year, the total yield is \$660.00. How much was invested at each year?

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3. The price of 55 citrons and 77 fragrant wood apples is 7373 units. The price of 77 citrons and 55 fragrant wood apples is 5959 units. Find the price of a citron and the price of a wood apple

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