Question

resolva os seguintes sistemas

A) 3x + 2y=40
x - 3y= -5



B) 2x + y= -9
x + 6y= 1

Answer 1

A) I  3x+2y=40
    II x-3y=-5
II x=3y-5

I 3(3y-5)+2y=40
I 9y-15+2y=40
I 11y=40+15
I y=55/11
I y=5
II x=3y-5
II x=3(5)-5
II x=15-5
II x=10