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3 October, 02:42

Ahmed is taking orders for lunch. A slice of pizza cost $2.9 and a chicken sandwich costs $3.9. He collects $25.3 for the group of 7 people.

Let x=number of pizza orders. Let y=number of chicken orders

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  1. 3 October, 05:40
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    X+Y=7

    2.9X+3.9Y=25.3

    Get X by itself: X=7-Y

    Substitute for X: 2.9 (7-Y) + 3.9Y=25.3

    Time it out: 19.5-2.9Y+3.9Y=25.3

    Add the Ys: 19.5+Y=25.3

    Subtract from both sides: Y=5

    So, X is equal to two orders, and Y is five.
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