Question

URGENTEEEEEH. resolva o sistemas abaixo pelo metodo da adçao ????
a) x-y=-2
x+2y=16

b) 2x+3y=5
x-3y=-2

c) x+y=12
x-y=-2

d) 3x+3y=9
x-3y=-1

e)2x+2y=10
x-y=1

f) 5x+y=6
2x-y=1

g) 4x+5y=45
x-y=0

Answer 1

a) x - y = -2 /.(-1)
x + 2y = 16
- x + y = 2
x + 2y = 16
3y = 18
y = 18/3
y = 6

b) 2x + 3y = 5
x - 3y = -2
3x = 3
x = 3/3
x = 1

c) x + y = 12
x - y = -2
2x = 10
x = 10/2
x = 5

d) 3x + 3y = 9
x - 3y = -1
4x = 8
x = 8/4
x = 2

e) 2x + 2y = 10
x - y = 1 /. (-2)

2x + 2y = 10
- 2x + 2y = -2
4y = 8
y = 8/4
y = 2

f) 5x + y = 6
2x - y = 1
7x = 7
x = 7/7
x = 1

g) 4x + 5y = 45
x - y = 0 /. (-4)

4x + 5y = 45
- 4x + 4y = 0
9y = 45
y = 45/9
y = 5