Answer:
- The system of equations is x + y = 85 and 7/20x+2/5y=31
- To eliminate the x-variable from the equations, you can multiply the equation with the fractions by 20 and multiply the other equation by -7.
- B-She used 60 minutes for calling and 25 minutes for data.
Step-by-step explanation:
It is always a good idea to start by defining variables in such a problem. Here, we can let x represent the number of calling minutes, and y represent the number of data minutes. The the total number of minutes used is ...
x + y = 85
The total of charges is the sum of the products of charge per minute and minutes used:
7/20x + 2/5y = 31.00
We can eliminate the x-variable in these equations by multiplying the first by -7 and the second by 20, then adding the result.
-7(x +y) +20(7/20x +2/5y) = -7(85) +20(31)
-7x -7y +7x +8y = -595 +620 . . . . eliminate parentheses
y = 25 . . . . . . . . simplify
Then the value of x is
x = 85 -y = 85 -25
x = 60
Answer:
X≤10/7
Step-by-step explanation:
7x-4≤6
add 4 both sides
7x-4+4≤6+4
7x≤10
divide 7 both sides
7x/7≤10/7
x≤10/7
hope it's helpful ❤❤❤❤
THANK YOU.
Answer: 1/6
-1/2 also equals -3/6
2/3 also equals 4/6
Using the number line, start at -1/2. Then, since the distance from one dash to the next on the line equals 1/6, you will move 4 spaces to the right. That should give you 1/6.
6 = x + 2/3
We're simply just trying to get "x" isolated.
So, we must subtract 2/3 from both sides.
6 - 2/3 = x
Simplify.
Turn 6 into an improper fraction.
6 is now 18/3 :)
So, our new problem looks like this :
18/3 - 2/3 = x
Simplify.
16/3 = x
Turn 16/3 into a mixed fraction.
How many times does 3 go into 16? 5 times! :)
So, we do this :
3 × 5 = 15
16 - 15 = 1
So, x = 5 1/3
~Hope I helped!~
