Question

me ajudem por favor a){x-y=1
resolver {x+y=9
b){x-y=2
{x+=12

c){x+y=9
{x-y=3
d){y=3+x
{x+y=5
me ajudem solver essas substituição de equações

Answer 1

a)
{x-y=1
{x+y=3
----------
2x=4
x=2
y=1

b)
{x-y=2
{x+y=12
-----------
2x=14
x=7
y=5

c)
{x+y=9
{x-y=3
-----------
2x=12
x=6
y=3

d)
{y=3+x
{x+y+5
x+3+x=5
2x=2
x=1
y=4

Answer 2

A
x-y=1
x+y=9
cortando os y teremos
2x=10
x=5

5+y=9
y=4
\\\\\\\\_________\\\\\\\\\
B
x-y=2
x+y=12
cortando os y teremos
2x=14
x=7

7+y=12
y=5
\\\\\\\\_________\\\\\\\\
C
x+y=9
x-y=3
cortando os y teremos
2x=12
x=6

6+y=9
y=3
\\\\\\\\\________\\\\\\\\
D
-x+y=3
x+y=5
cortando os x teremos
2y=8
y=4

x+4=5
x=1