Question

Tolong Di Jawab Ya,,Pleasee

Answer 1

Verified answer

1) x + y = 10
x - y = 4
------------------(-)
2y = 6
y = 3
• x + y = 10
x - y = 4
------------------(+)
2x = 14
x = 7
hp = ( 7, 3 )

2) x - 2y = 9
2x + 2y = 6
------------------(+)
3x = 15
x = 5
• x - 2y = 9 |×2
2x + 2y = 6
maka
2x - 4y = 18
2x + 2y = 6
-----------------(-)
- 2y = 12
y = - 6
hp = ( 5,-6)

3) 2x + 3y = - 1
4x + 3y = 7
---------------------(-)
- 2x = - 8
x = 4
• 2x + 3y = - 1 |×2
4x + 3y = 7
maka
4x + 6y = - 2
4x + 3y = 7
-------------------(-)
9y = - 9
y = - 1
hp = ( 4,-1 )

Answer 2

1.

x + y = 10
x - y = 4
________ +
2x = 14
x = 14/2
x = 7

x + y = 10
7 + y = 10
y = 10-7
y = 3

2.

x - 2y = 9
2x + 2y = 6
__________ +
3x = 15
x = 15/3
x = 5

x - 2y = 9
5 - 2y = 9
2y = 9-5
2y = 4
y = 4/2
y = 2

3.

2x + 3y = -1
4x + 3y = 7
_________ -
-2 x = -8
x = -8/-2
x = 4

2x + 3y = -1
8 + 3y = -1
3y = -1-8
3y = -9
y = -9/3
y = -3

semoga bermanfaat