Suma dwoch liczb jest rowna 70, a rózniaca podwojonej liczby pierwszej i polowy drugiej jest rowna 40. Jakie to liczby?
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x+y=70
2x-1/2y=40 /*2
x+y=70
4x-y=80
5x=150
x=30
y=40
a+ b = 70
2a - 0,5b = 40
a = 70 -b
2 (70 -b) - 0,5b = 40
a = 70 -b
140 - 2b - 0,5b = 40
a = 70 -b
-2,5b=-100 /:(-2,5)
a = 70 -b
b= 40
a = 70 - 40
b= 40
a= 30
b= 40
Odp.: Pierwsza liczba to 30, a druga to 40.