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lalanduni
18.09.2019 •
Mathematics
What is the equation of the line shown, (-4,1) and (2,1)?
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Ответ:
Let's find m first using the equation for slope. It is the rise of the line which is the difference of the two y coordinates of the points divided by the difference of the two x coordinates of the points (-4,1) and (2,1):
m = (y₂ - y₁)/(x₂ - x₁)
m = (1 - 1)/(-4 - 2)
m = 0/-6
m = 0
This means the lie is going to be completely horizontal since it has no slope.
Now to find b, we have to find the entire equation of the line through a method called "point-slope form" of a line:
y - y₁ = m(x - x₁)
You simply plug a given point into this equation (x₁, y₁) and the slope m, and the equation in the end will look like the standard form y = mx + b:
y - 1 = 0(x - 2)
y -1 = 0
y = 1
This line would go through the y axis at the point (0, 1) and continue onward forever in both directions horizontally.
Ответ:
480 ft
Step-by-step explanation:
First, every | on the line worth 40: the number of | from 0 to 400/-400 is 10 so -400/400÷10=-40/40. Also, if you go right from 0 it's positive (40) and if you go left to 0 it's negative (-40).
Karina is at - 240 because - 40*6=-240 ang Lucas is at 240 because 40*6=240.
Karina is 240 feet apart from 0 and so does Lucas, so they are 480 feet apart because 240+240=480.