Apples and bananas

If you pay $11 for one apple and nine bananas and $7 for three apples and one banana, how much do 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  Pivot:Row1Row2 3a+b=7 a+9b=11  Row231 Row1Row2 3a+b=7 8.67b=8.67  b=8.666666678.66666667=1 a=37b=371=2=2 USD  a=2 b=1



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