Question

if y-n is 18then y+n is?​

Answer 1

Given:

y - n = 18.

To find:

y + n

Solution:

If n is known,

y - n = 18.

Therefore, y = 18 + n

Sub. y = 18 + n in y + n we get,

y + n

= 18 + n + n

= 18 + 2n

If y is known,

y - n = 18

Therefore, n = -18 + y

Sub. n = -18 + y in y + n

y + n

= y + (-18) + y

= 2y - 18

Conclusion:

If n is known, then to find y + n we should use 18 + 2n (substitute the value of n)

If y is known, then to find y + n we should use 2y - 18 (substitute the value of y)

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Answer 2

Given:

y - n = 18.

To find:

y + n

Solution:

If n is known,

y - n = 18.

Therefore,

y = 18 + n

Sub. y = 18 + n in y + n we get,

y + n

= 18 + n + n

= 18 + 2n

If y is known,

y - n = 18

Therefore,

n = -18 + y

Sub. n = -18 + y in y + n

y + n

= y + (-18) + y

= 2y - 18

Conclusion:

If n is known, then to find y + n we should use 18 + 2n (substitute the value of n)

If y is known, then to find y + n we should use 2y - 18 (substitute the value of y)