babystar16
  • babystar16
the sum of 2 numbers is 25. and their difference is 7. find the number.
Mathematics
schrodinger
  • schrodinger
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LukeBlueFive
  • LukeBlueFive
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.
babystar16
  • babystar16
ty
LukeBlueFive
  • LukeBlueFive
yw

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anonymous
  • anonymous
x+y=25 x-y=7....on solvng.. x=16,y=9
babystar16
  • babystar16
ok got a new question
babystar16
  • babystar16
the length of a rectangle is 5 more than twice the width. the permiter is 130 in. what is the area
anonymous
  • anonymous
yea ask..
anonymous
  • anonymous
5b+b=130 bredth=21.6 length=108.4
anonymous
  • anonymous
area=lb=2341.4
anonymous
  • anonymous
sory...b=10.8 i=54.2 area=587
LukeBlueFive
  • LukeBlueFive
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.
LukeBlueFive
  • LukeBlueFive
Then multiply the length times the width to get the area, since: \[Area = length \times width\] Gives the area of a rectangle.
anonymous
  • anonymous
hey u got the sol @babystar 16
babystar16
  • babystar16
ty

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