Question

2x+3y=19 x+y=3 conta e resposta

Answer 1

2x + 3y = 19
x + y = 3

9 - 19/ 3 - 2
-10/1 = -10

x = -10

-20 + 3y = 19
3y = 19 + 20
3y = 39
y = 39/3
y = 13

Answer 2

Ola Vitoria

a)

2x + 3y = 19
x + y = 3

2x + 3y = 19
3x + 3y = 9

x = -10

-20 + 3y = 19
3y = 39
y = 13

b)

x + 2y = 17
x - 2y = -11

2x = 6
x = 3

3 + 2y = 17
2y = 14
y = 7

c)

A + B = 18
2A + B = 25
A = 7

7 + B = 18
B = 11

d)

x + y = 37
x - y = 9

2x = 46
x = 23

23 + y = 37
y = 4

e)

2x + y = 6
x + 3y = 2
6x + 3y = 18

5x = 16
x = 16/5

16/5 + 3y = 10/5
3y = -6/5 
y = -2/5 

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