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2014-10-15T17:20:42+03:00
A+b=125⇒b=125-a
3a+5=b⇒3a+5=125-a⇒4a=120⇒a=30
b=125-40⇒b=95
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2014-10-15T17:20:48+03:00
A+b=125
a=5+3b
a=?
b=?

Inlocuim "a-ul" cu ce ne-au dat ei (a=5+3b) in "a+b=125" si aflam "b-ul".

a+b=125 => 5+3b+b=125 / -5 => 4b(pentrut ca aveam 3b+b)=120 / :4 => b=30

Inlocuim "b-ul" cu ce am aflat (b=30) in "a+b=125" si aflam "a-ul".

a+b=125 => a+30=125 / -30 => a=95