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21 June, 12:15

The total cost of 4 goldfish and 3 guppies is $29. 3 goldfish and 5 guppoes cost $30. How much does each cost

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  1. 21 June, 14:06
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    let the goldfish be x and the guppies be y

    4x + 3y = 29 ... equ (1)

    3x + 5y = 30 ... equ (2)

    multiplying equation 1 by 5 and equation 2 by 3

    20x + 15y = 145 ... equ (1)

    9x + 15y = 90 ... equ (2)

    subtracting equation 2 from 1

    11x = 55

    ∴x = 5

    substituting the value of x into equation

    4 (5) + 3y = 29

    20 + 3y = 29

    3y = 9

    ∴y = 3
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