Question

A) {y=x+4 y=-x+4 b) {y=-x=7 y+x=7 c) {x+2y+9 y-1+3x

Answer 1

{y=x+4

{y=-x+4  |skracamy 'x'

 

2y=8

y=4

 

y=x+4 |podstawiamy y

4=x+4

x=0 

 

 

B)

{y-x=7

{y+x=7

2y=14

y=7

x=0