Question

Equação

(4x+6y=100
(2x-2y=38

Answer 1

multiplicar a debaixo por -2              4X=85.6

                                                           X=85,6/4

4X+6Y=100                                        X= 21,4

-4X+4Y=-76                                        substituindo

somando as equação fica                  4X+6Y=100

0+10Y=24                                           4(21,4)+6(2.4)=100

Y=24/10

Y=2,4

4X+6Y=100

4x+6(2,4)=100

4X+14,4=100

4X=100-14,4