What is the slope of a line that passes through (5, 2) and (8, 1)?

How to work out slope of a line:

Take the y coordinate of the first point, and subtract it from the y coordinate of the the second point, like so:

y₁ - y₂ = 2 - 1

         = 1

(note: y₁ is the y coordinate of the first point, and y₂ is the y coordinate of the second point)

Next, take the x coordinate of the first point and subtract it from the x coordinate of the second point, like so:

x₁ - x₂ = 5 - 8

         = -3

(note: x₁ is the x coordinate of the first point, and x₂ is the x coordinate of the second point)

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Now to get the slope, all we do is divide the value of (y₁ - y₂) by (x₁ - x₂):

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The slope of a line that passes through (5, 2) and (8, 1) is:

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step-by-step explanation:

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a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional