Apples and bananas

If you pay $11 for 1 apple and 9 bananas and pay $7 for 3 apples and 1 banana, how much does an apple and banana cost?

Correct answer:

a =  2 USD
b =  1 USD

Step-by-step explanation:

11=a+9b 7=3a+b  11=a+9 b 7=3 a+b  a+9b=11 3a+b=7  a=2=2 USD b=1

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