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24 July, 10:32

Two numbers total 77 and have a difference of 21. find the two numbers

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  1. 24 July, 13:50
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    So we can create two expressions to represent these.

    X+Y=77

    X-Y=21

    we can use substitution or elimination

    let's rearrange one of the equations.

    let's make X-Y=21. let's move the y over!

    X=y+21 now we can plug it in to the other equation!

    y+21+y=77

    2y+21=77

    move 21 over ...

    2y=56

    y=28! just use this value to find X

    use any equation you want.

    X+28=77

    X=49

    two values are 49 and 28
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