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6 October, 02:28

The sum of real numbers x and y is 21. Their differnce is 15. What is the value of xy?

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  1. 6 October, 03:57
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    Y + - Y=0. 2X=34 Then divide both sides by the number next to "X." X=17 Then substitute X=17 into X+Y=21. Then you get 17 + Y=21. Y=21-17=4 Next check your answers by substituting into each equation above to see if both work and are true. 17+4=21

    21=21

    17-4=13

    13=13
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