Question

aflatii a si b daca$\frac{a}{b} = \frac{3}{7} si 2a+5b=82$ Urgent va rogg

Answer 1

a/b=3/7 ⇒ 7a=3b ⇒ 7a-3b=0 ⇒ 35a-15b=0;
2a+5b=82 ⇒ 6a+15b=246;
35a-15b+6a+15b=246 ⇒ 41a=246, a=6;
42=3b ⇒ b=14.