Question

Resolva
os sistemas
Lineares
a seguir:a){X+y=28 y=15 b)2x-y=-1x+y=7​

Answer 1

A) {x+y=28 (-1) 》 - x - y = - 28

{ y = 15 》 y = 15

-x = 13

X = -13

X + y = 28

-13 + y =28

y =28 + 13

y = 41

B) 2x - y = -1

X +Y = 7

3x = 6

X= 6/3

X = 2

X+Y = 7

2+ y = 7

Y= 7 - 2

Y =5