Shopping vegetables

John and his mother were shopping. My mother bought 2 kg of peaches and 5 kg of potatoes and paid CZK 173. The neighbor bought 3 kg of peaches and 4 kg of potatoes and paid CZK 186. How much did 1 kg of peaches and 1 kg of potatoes cost?

Correct answer:

a =  34
b =  21

Step-by-step explanation:

2a+5b = 173
3a + 4b = 186

2•a+5•b = 173
3•a + 4•b = 186

2a+5b = 173
3a+4b = 186

a = 34
b = 21

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