<h2>
Hello!</h2>
The answer is:
It takes Ella 3 seconds to do a push-up and 3 seconds to do a sit up.
<h2>Why?</h2>
To find how many seconds Ella took to do a push-up and a sit-up we must write two equations using the given information.
Let be "x" the time needed to push-ups and "y" be the time needed to do sit-ups.
So, writing the equations we have:
First equation,
If she can do 13 push-ups and 7 sit-ups in 60 seconds, we have:
Second equation,
If she can do 13 push-ups and 19 sit-ups in 96 seconds, we have:
Now, creating a system of equations, and using the reduction method to solve it, we have:
Multiplying the first equation by -1, we have:
Then, substituting "y" into the first equation, we have:
Hence, we have that It takes Ella 3 seconds to do a push-up and 3 seconds to do a sit up.
Have a nice day!
Answer:
Hi,can you please answer mine too I really need the answer because I have to pass it later at 10 pm and it's already 9:24pm it's just 2 questions 17-18:(
Directions: Simplify the following monomials (if possible).
17.) Subtract 9a from -15a
18.) From -9cd², subtract -2cd²
I hope you can help me:(
Step-by-step explanation:
about your question I'll just put it in the comment section:)
Is this like 3 separate questions, or is it like
one all together with one answer?
Answer:
y=3x+4
Step-by-step explanation:
first you find the slope by doing change in y over change in x. The change in y is 9 because 7-(-2)=9. The change in x is 3 because 1-(-2)=3. Then you do 9/3 which is 3, which is your slope, or m.
So now you know y=3x+b, then you substitute one of the points in for x and y, and you get 7=3(1)+b, where b is your y-intercept. then you solve, and find that b=4.
Now you put it into slope intercept form, which is y=mx+b, where m=3 and b=4, so you are left with y=3x+4.
Leave a thanks if I am correct please.
The answer is B, I hope this helps! (don't forget to give brainliest)
