Question

2x+7y=17 5x-y=-13quero saber esse sistema

Answer 1

2x+7y=17
5x-y=-13 =>-y=-13-5x => y=13+5x encontramos o y para substituir na 1º

2x+7(12+5x)=17
2x+84+35x=17
37x=17-84
37x=-67
x=-67/37 x=-1,810810810810811

5x-y=-13
5(-67/37)-y=-13
335/37-y=13
y=335/37-13
y=-3,945945945945946