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datgamer13
19.06.2021 •
Mathematics
What are the coordinates of the point on the directed line segment from (- 3, - 9) to (4, 5) that partitions the segment into a ratio of 5 to 2?
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Ответ:
(0,-1)
Step-by-step explanation:
Let the ends of the line segments be A(-4,3) and B(5,-6).
Ratio=4:5
By the concept of cordinate geometry,
x=(mx2+nx1)/(m+n)
y=(my2+ny1)/(m+n)
where m and n is the ratio m:n.
So, here the cordinates are
x={4(5)+5(-4)}/(4+5)
x=(20–20)/9
x=0
y={4(-6)+5(3)}/9
y={-24+15}/9
y=(-9)/9
y=(-1)
Therefore the cordinates of the point that divides the given line segment in the ratio 4 : 5 is (0,-1)
:)
Ответ:
A.
B. Point Slope Form: and Slope-Intercept Form:
C. Independent
D.
Step-by-step explanation:
Given 2 points on Sidewalk 1: and .
Given 2 points on Sidewalk 2: and
General equation for Slope-Intercept Form of a line:
Where,
m is the slope, and [NOTE: is point 1 and is point 2]
b is the y-intercept [point where the line crosses the y-axis]
General form of Point-Slope Form of a line:
Where,
m is the slope, and
is point 1
A.
Slope-Intercept from is given by
Finding m using formula above gives us:
Plugging in any one point, let us substitute , in x and y respectively gives us value of b:
Now we can write:
B.
Solving for m for sidewalk 2 using points above and slope formula, we get:
Point-Slope form using formula above:
Rearranging this in slope-intercept form, we have:
C.
2 lines DOES NOT have any solution when:
1. They are the same line [coefficients of one line are multiple of coefficient of another line ]
2. They are parallel [ when slope of one line is equal to slope of another line ]
Here, none of these occurs, so we HAVE a solution.
Hence, the system of equations are said to be INDEPENDENT.
D.
Since, the 2 equations have a solution [they have an intersection point], let's solve for the intersecting point.
We have the equations and
We set both of them equal [y=y] and solve for x:
Now substitute this value of x into either equation to get y. Let's do it on equation 1:
So, point of intersection is