Question

3x-2y=2. x+y=4



5x+10y=15
2x+3y=5


2a+4b=3
a+b=1
​

Answer 1

Resposta:

A)

3x-2y=2

x+y=4 (-3)

3x-2y=2

-3x+y=4

y=6

x+6=4

x=4-6

x=-2

B)

5x+10y=15 (-2)

2x+3y=5 (5)

-10x-20y=-30

10x+15y=25

-5y=-5

y=-5/-5

y=1

2x+3.1=5

2x+3=5

2x=5-3

2x=2

x=2/2

x=1