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

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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.

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Other answers:

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

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