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23 February, 05:50

giselle is 4 years older than her brother marco. the sum of their ages is 30. Write and solve a system of equations to find their ages

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  1. 23 February, 08:14
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    Because we don't know Marco's age just put x in instead

    4+x=30

    To find x in this equation you have to isolate it. You do that by subtracting 4

    30-4=x

    That means that x=26
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