Question

Tolong di jawab semuanya ya kak...... mau di kumpul :D

Answer 1

Verified answer

A1) 2x - y = 1
- y = - 2x + 1
y = 2x - 1
subtitusi
3x - 5y = - 9
3x - 5(2x - 1) = - 9
3x - 10x + 5 = - 9
- 7x = - 9 - 5
x = - 14 ÷ - 7
x = 2
subtitusi
y = 2x - 1
y = 2(2) - 1
y = 4 - 1
y = 3
hp = ( 2 , 3 )

2) x + 5y = 2
x = - 5y + 2
subtitusi
4x + 2y = - 10
4(-5y + 2) + 2y = - 10
- 20y + 8 + 2y = - 10
- 18y = - 10 - 8
y = - 18 ÷ - 18
y = 1
subtitusi
x = - 5y + 2
x = - 5(1) + 2
x = - 5 + 2
x = - 3
hp = ( - 3, 1 )

3) 2x + 3y = 7
2x = - 3y + 7
x = - 3/2 y + 7/2
subtitusi
5x + 2y = 1
5(-3/2 y + 7/2 ) + 2y = 1
- 15/2 y + 35/2 + 2y = 1 ( dikali 2)
- 15y + 35 + 4y = 2
- 11y = 2 - 35
y = - 33 ÷ - 11
y = 3
subtitusi
2x = - 3y + 7
2x = - 3(3) + 7
2x = - 9 + 7
2x = - 2
x = - 1
hp = ( - 1 , 3 )