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2 answers:
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Answer:
Whenever .
Step-by-step explanation:
We can play around with some numbers and develop some rules for this equation.
Note that the number 5 and -5 are used here, so let's try using 5 as a.
So 5 works. Let's try a random number like 3.
Okay, with this info we know that we might be able to develop one rule that . Just to test, let's try 0, -3, and -5.
Zero works.
-3 works.
-5 works. Now, this might stop here making the equation , so let's test a number outside of -5 - say -20.
Yes! This works, so a works for this equation as long as .
Hope this helped!
Answer:
Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form or
Let
x -----> the amount of weight
y ----- the amount a spring will stretch
we know that
For x=80 lb, y=2.1 in
<em>Find the value of k (constant of proportionality)</em>
substitute the values
The linear equation is
How far will it stretch when 40 pounds is attached?
For x=40 lb
substitute the value of x in the linear equation and solve for y