Question

Daca a+b=146, b+c=100sl 13a + 2c+3b=1582 afla valorile lui a, b, c

Answer 1

a+b=146=> a=146-b
b+c=100=> c=100-b
13a+ 2*c+3b=1582
13*(146-b)+2*(100-b)+3b=1582
13*146-13b+2*100-2b+3b=1582
1898-13b+200+b=1582
-12b+ 2098=1582
-12b=1582-2098
-12b=-516
b=-516/-12
b=43
a+b=146
a+43=146
a=146-43
a=103
b+c=100
43+c=100
c=100-43
c=57