The sum of two decimal numbers is 3.9
Their difference is 0.9,and their product is 3.6
What are the two numbers?
x+y = 3.9
x-y = .9
add them
2x = 4.8
x = 2.4
then y = 3.9-2.4 = 1.5
check:
what is the product?
2.4(1.5) = 3.6
BTW, the last bit of information was not necessary.
GIRLS JUST WANNA HAVE FUN.
THAT DID NOT HELP
3.9
5.13
5.13
To find the two decimal numbers, let's assign variables to each number. Let's call the first number x and the second number y.
From the given information, we have the following equations:
Equation 1: x + y = 3.9 (sum of the two numbers is 3.9)
Equation 2: x - y = 0.9 (difference of the two numbers is 0.9)
Equation 3: x * y = 3.6 (product of the two numbers is 3.6)
Now we have a system of three equations with two variables.
To solve this system, we can use the method of substitution or elimination. Let's solve it using the method of substitution:
From Equation 2, we have:
x = y + 0.9
Substitute this value of x in Equation 1:
(y + 0.9) + y = 3.9
2y + 0.9 = 3.9
2y = 3.9 - 0.9
2y = 3
Divide both sides by 2:
y = 3 / 2
y = 1.5
Now substitute this value of y in Equation 2:
x - 1.5 = 0.9
x = 0.9 + 1.5
x = 2.4
Therefore, the two numbers are x = 2.4 and y = 1.5.