Pair

The pair have been together 39 years. He has two times as she was when he was equal as she has today. How old are they?

Correct answer:

x =  26
y =  13

Step-by-step explanation:


x+y = 39
39+y=2x

x+y = 39
39+y=2·x

x+y = 39
2x-y = 39

Pivot: Row 1 ↔ Row 2
2x-y = 39
x+y = 39

Row 2 - 1/2 · Row 1 → Row 2
2x-y = 39
1.5y = 19.5


y = 19.5/1.5 = 13
x = 39+y/2 = 39+13/2 = 26

x = 26
y = 13

Our linear equations calculator calculates it.



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