Brain Easier

Geometry Level 2

Which of the following point will be collinear with (0,1) and (-2,5)?

(4,5) (2,-3) (3,0) (-2,3)

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3 solutions

For three points to be collinear, they must have the same slope.

Step 1. Calculate the slope of the line using the formula m = y 2 y 1 x 2 x 1 m=\dfrac{y_2-y_1}{x_2-x_1}

m = 5 1 2 0 = 2 m=\dfrac{5-1}{-2-0}=-2

Step 2. From the choices use the guess and check method.

point ( 2 , 3 ) (-2,3)

2 = 5 3 2 + 2 -2=\dfrac{5-3}{-2+2} the statement is not true

point ( 4 , 5 ) (4,5)

2 = 5 5 2 4 -2=\dfrac{5-5}{-2-4} the statement is not true

point ( 2 , 3 ) (2,-3)

2 = 5 + 3 2 2 -2=\dfrac{5+3}{-2-2} the statement is true

So the desired answer is ( 2 , 3 ) (2,-3) .

Rico Lee
May 8, 2016

Basic geometry :) If points are collinear, then all points that share the same equation will sit on the same line.

1) Find the gradient of the line----> 1 5 0 ( 2 ) \frac{1-5}{0-(-2)} = -2

2) Using our gradient m= -2, input it in the form y=-2x+c

3) Imput any point of your desire. In this case, I will use (0,1).

4) 1= -2(0)+c, 1=c. This means our y intercept is 1.

5) Complete the formula of y= -2x+1

6) Imput the available multiple choice options into your formula. The correct answe is B, or (2,-3)

This means (2,-3) (0,1) and (-2,5) are all collinear. When graphed, they are all on the same line. :)

Adi Pratama
May 7, 2016

Um.. It is good that you are providing a website but can you plz post your solytion to reflect your approach ;)

Ashish Menon - 5 years, 1 month ago

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