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spidol=y
3x+5y=11000
2x+4y=8000
6x+10y=22000
6x+12y=24000
-2y=-2000
y=1000
2x+4(1000)=8000
2x+4000=8000
2x=4000
x=2000
4x+3y=4(2000)+3(1000)=11000
spidol =b
3a+5b=11000. |x2|
2a+4b=8000. |x3|
------------
6a+10b=22000
6a+12b=24000
------------- -
-2b= -2000
b = -2000/-2
b = 1000
substitusikan
2a+4b= 8000
2a+4(1000)=8000
2a+4000=8000
2a = 8000-4000
2a = 4000
a = 4000/2
a = 2000
jadi harga 4 pulpen dan 3 spidol adalah
4a+3b= 4(2000) + 3(1000)
=8000 + 3000
= 11000