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Alina [70]
3 years ago
8

The value of two numbers if their sum is 21 and their difference is 3

Mathematics
2 answers:
blsea [12.9K]3 years ago
8 0

Answer:

The numbers are:   '12' and '9'

Step-by-step explanation:

Let the numbers be 'x' and 'y'

x+y=21    Equation:1

x-y=3      Equation:2

Finding the value of one variable from a equation and putting it in the other equation:

From equation:2

x-y=3

Adding 'y' both sides:

x=3+y      Equation:3

Put the 'x' in Equation:1

x+y=21

(3+y)+y=21

Adding the like terms:

3+2y=21

Subtracting '3' both sides:

2y=21-3\\\\2y=18

Dividing by '2' both sides:

y=18/2\\\\y=9

Put the value of 'y' in Equation:3

x=3+y

x=3+9\\\\x=12

The numbers are:   '12' and '9'

iragen [17]3 years ago
6 0

Answer:

9 and 12

Step-by-step explanation:

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