Question

Resolva os sistemas:
a) x+y=5
x-y=1

b) 3x+5y=11
5x-5y=5

c) 3x+7y=38
x+7y=36

Answer 1

A) 2x=6. x=3 B)8x=16. C) 3x+7y=38 (-1) x=2. x+7y =36 ------------------------------- -3X-7y= -38 x+7y =36 --------------------- -2x=-2 -1 X= 1