Chemistry
bryanavila51993
2021-02-23 07:03:18
The sum of two numbers is 30 and their difference is 12 find the two numbers
ANSWERS
oreo
2021-02-23 12:08:54

Let us assume the two unknown numbers to be x and y. Then x + y = 30 x - y = 12 Now let us take the second equation first x - y = 12 x = y + 12 Now we have to put the value of x in the first equation. x + y = 30 y + 12 + y = 30 2y = 30 - 12 2y = 18 y = 9 Now let us put the value of y in the first equation again x + y = 30 x + 9 = 30 x = 30 - 9    = 21 So we have found from the above deduction that the two numbers are 21 and 9.

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