Find two numbers with a sum of 15 and a difference of 4

The numbers are

5.5 and 9.5,

Step-by-step explanation:

If the numbers are x and y:

x + y = 15

x - y = 4          

If we add these 2 equations we eliminate y, so

2x = 19

x =  19/2 = 9.5.

Substituting in the first equation for x:

9. 5 + y = 15

y = 15 - 9.5 = 5.5

Step-by-step explanation:

X+Y=15

X-Y= 4

=> X-Y+2Y=15

<=> 4+2Y= 15

=> Y= 5,5

=>X = 15-5,5=9,5

Vậy 2 số đó là 9,5 và 5,5

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

hope this !

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.