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1 topi = 150.000
Jadi 4 kaos dan 3 topi adalah 930.000
topi=b
3a+4b=960.000|×5|15a+20b=4.800.000
2a+5b=990.000|×4|8a+20b=3.960.000
_____________________ -
7a. =840.000
a=840.000÷7
a=120.000
3a+4b=960.000
3(120.000)+4b=960.000
360.000+4b=960.000
4b. =960.000-360.000
4b. =600.000
b. =600.000÷4
b. =150.000
jadi 4 kaos dan 3 topi= 4a+3b=4(120.000)+3(150.000)=480.000+450.000=930.000
semoga membantu:-)