Twice the difference of a number and 9 is 8

13

Step-by-step explanation:

Think: 2(x-9)=8; x = the answer

2(x-9)=8

2x-18=8   (distributive property)

2x=26     (add 18 to both sides)

x=13         (divide both sides by 2)

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the correct answer is option c.   3

step-by-step explanation:

points to remember

equation of the line with coordinates (x₁, y₁) and (x₂, y₂) is given by,

slope m = (y₂ - y₁)/(x₂ - x₁)

from the figure we can see a line with two coordinates given

to find the slope of given line

here   (x₁, y₁)   = (-1, -1 ) and (x₂, y₂) = (1, 5)

slope m = (y₂ - y₁)/(x₂ - x₁)

  = (5 - -1)/(1 - -1)

  = (5 + 1)/(1 + 1)

  = 6/2 = 3

therefore the correct answer is option c.   3

lol

step-by-step explanation: