What is four-fifths of twenty?
2 answers:
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Remember that the general equation of a line is 
, where:
is the slope, and 
is the y-intercept; so to find the y-intercept, solve for 
and identify .
Now, to find the x-intercept, just replace in your line equation with 
, and solve for 
Lets apply those procedures to our two questions:
1. - y-intercept:
Notice that now we have our line equation in the form with 
and 
; sine is the y-intercept, we can conclude that the y-intercept of our equation is 8.
x-intercept:
First, lets replace with :
And then, we can solve for to find our x-intercept:
We can conclude that our x-intercept is -4; thus the correct answer in your list is the fourth one: x-intercept is -4; y-intercept is 8.
2. y-intercept:
We can conclude that our y-intercept is 20.
x-intercept:
We can conclude that our x-intercept is 16; thus the correct answer in your list is, once again, the fourth one: x-intercept is 16; y-intercept is 20.
Now, to find the x-intercept, just replace
Lets apply those procedures to our two questions:
1. - y-intercept:
Notice that now we have our line equation in the form
x-intercept:
First, lets replace
And then, we can solve for
We can conclude that our x-intercept is -4; thus the correct answer in your list is the fourth one: x-intercept is -4; y-intercept is 8.
2. y-intercept:
We can conclude that our y-intercept is 20.
x-intercept:
We can conclude that our x-intercept is 16; thus the correct answer in your list is, once again, the fourth one: x-intercept is 16; y-intercept is 20.
Answer:
x=3 meters
Step-by-step explanation:
step 1
Find the area of the rectangular pool
we have
substitute
step 2
Find the area of rectangular pool including the area of the walkway
Let
x ----> the width of the walkway
we have
substitute
step 3
Find the area of the walkway
To find out the area of the walkway subtract the area of the pool from the area of rectangular pool including the area of the walkway
so
step 4
Find the value of x if the area of the walkway equal the area of the pool
so
Solve for x
Solve the quadratic equation by graphing
The solution is x=3 meters
see the attached figure
