Question

Stiind ca 7a+3b supra 5a+b =8 supra 5 ,calculeaza a supra b.

Answer 1

⇒7a+3b/5a+b=8/5
⇒35a+15b=40a+8b
⇒5a=7b
⇒a/b=7/5

Answer 2

7a+3b/5a+b=8/5 => 8(5a+b)=5(7a+3b) => 40a+8b=35a+15b => 40a-35a=15b-8b => 5a=7b => a/b=7/5