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babystar16

  • 3 years ago

the sum of 2 numbers is 25. and their difference is 7. find the number.

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  1. LukeBlueFive
    • 3 years ago
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    This is equivalent to the following series of equations: \[x + y = 25\] \[x = y - 7\] So, substitute the second equation into the first: \[(y - 7) + y = 25\] Simplify, and you'll have y. Then, plug that value of y into the second equation to get x.

  2. babystar16
    • 3 years ago
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    ty

  3. LukeBlueFive
    • 3 years ago
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    yw

  4. pkjha3105
    • 3 years ago
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    x+y=25 x-y=7....on solvng.. x=16,y=9

  5. babystar16
    • 3 years ago
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    ok got a new question

  6. babystar16
    • 3 years ago
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    the length of a rectangle is 5 more than twice the width. the permiter is 130 in. what is the area

  7. pkjha3105
    • 3 years ago
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    yea ask..

  8. pkjha3105
    • 3 years ago
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    5b+b=130 bredth=21.6 length=108.4

  9. pkjha3105
    • 3 years ago
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    area=lb=2341.4

  10. pkjha3105
    • 3 years ago
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    sory...b=10.8 i=54.2 area=587

  11. LukeBlueFive
    • 3 years ago
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    This equation gives the perimeter of a rectangle: \[2 \times length + 2 \times width\] In this case, the following is true as well: \[length = 2 \times width + 5\] Substitute this into the first equation and solve like the previous problem.

  12. LukeBlueFive
    • 3 years ago
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    Then multiply the length times the width to get the area, since: \[Area = length \times width\] Gives the area of a rectangle.

  13. pkjha3105
    • 3 years ago
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    hey u got the sol @babystar 16

  14. babystar16
    • 3 years ago
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    ty

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