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a factory assembly 4-cylinder and 6-cylinder engines . how many motors of each kind must the factory make to fill an order for 20 engines with a total of 92 cylinders ?
 

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Arthur D. | Effective Mathematics TutorEffective Mathematics Tutor
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4x+6y=92
x+y=20
x=20-y
4(20-y)+6y=92
80-4y+6y=92
80+2y=92
2y=92-80
2y=12
y=6 6-cylider engines
x=20-6=14 4-cylinder engines