tolong jawab no,31,32,33 ya penyelesaian nya juga mohon dimohon kamsamida...

31)
2x+3y=9 |×1|2x+3y=9
x+y = 4 |×2| 2x+2y=8 (-)
y=1

x+y=4
x+1=4
x=4-1
x=3

z=4x+3y
=4.3+3.1
=12+3
=15

33)
2x+3y=36|×2|4x+6y=72
4x+y=32 |×1| 4x+y=32
5y=40
y=40/5
y=8

4x+y=32
4x+8=32
4x=32-8
x=24/4
x=6

z=6x+5y
=6.6+5.8
=36+40
=76

Jawabannya:
31. 2x+3y=9 |×1|
x+y=4. |×2|

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

x+y=4
x+1=4
x=4-1
x=3

z=4x+3y
= 4.3+3.1
= 12+3
= 15

32. C. 126

33. 2x+3y=36 |×2|
4x+y= 32 |×1|

4x+6y=72
4x+y=32
--------------- -
5y= 40
y= 40/5
y= 8

4x+y=32
4x+8=32
4x=32-8
4x=24
x= 24/4
x=6

z= 6x+5y
= 6.6+5.8
= 36+40
= 76

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