Răspuns :
Explicație pas cu pas:
a+b=30
4a+3b=100
a=30-b
4a+3b=100
a=30-b
4*(30-b)+3b=100
a=30-b
120-4b+3b=100
a=30-b
-b=-20
a=30-20
b=20
a=10
b=20
Răspuns:
a+b=30=>a=30-b
4a+3b=100
4(30-b)+3b=100
120-4b+3b=100
b=120-100=>b=20
a=30-20=>a=10
Explicație pas cu pas:
a+b=30
4a+3b=100
a=30-b
4a+3b=100
a=30-b
4*(30-b)+3b=100
a=30-b
120-4b+3b=100
a=30-b
-b=-20
a=30-20
b=20
a=10
b=20
Răspuns:
a+b=30=>a=30-b
4a+3b=100
4(30-b)+3b=100
120-4b+3b=100
b=120-100=>b=20
a=30-20=>a=10