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11 May, 19:11

Lena bought a total of 20 postcards. She bought 6 more large postcards than small. Write a system of equations that represents the postcards Lena purchased. Solve the system by substitution. Interpret the solution.

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  1. 11 May, 19:19
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    X = small postcards

    y = large postcars

    x+y=20

    y=x+6

    x + (x+6) = 20

    x + x + 6 = 20

    2x = 20-6

    2x=14 / : 2

    x = 7. - - > the number of small postcards is 7.

    x+y=20

    7+y=20

    y=20-7

    y=13 - - > the number of large postcards is 13.

    also y=x+6 = 7+6=13.
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