Question

a )2x+3y=14 b)2x-6y=4 c)6x+2y=-4 d)4x+y=19
x-2y=-7 3x+2y=17 2x+y=-1 x-y=-4

Answer 1

Boa noite


a)

2x + 3y = 14,
x - 2y = -6 

2x + 3y = 14
2x - 4y = -12
7y = 26
y = 26/7
x = 2y - 6
x = 52/7 - 42/7 = 10/7 

b)

x - 3y = 2
3x + 2y = 17

2x - 6y = 4
9x + 6y = 51
11x = 55
x = 5

5 - 3y = 2
3y = 3
y = 1

c) 

3x + y = -2,
2x + y = -1

x - 1 = -2
x = -1

-3 + y = -2
y = 1

d)

4x + y = 19,
x - y = -4 

5x = 15
x = 3

3 - y = -4
y = 7