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3 years ago

What is the equation of the line that goes through the points (1,2) and (2,1)?

Mathematics

1 answer:

Mandarinka [93]3 years ago

4 0

Answer:

y = -x+3

Step-by-step explanation:

We have two points so we can find the slope

m =(y2-y1)/(x2-x1)

(1-2)/(2-1)

-1/1

The slope is -1

We can use the slope intercept form of the equation

y = mx+b where m is the slope and b is the y intercept

y = -x+b

Substitute a point into the equation to find b

2 = -1 +b

Add 1 to each side

2+1 =-1+1 +b

3 =b

y = -x+3

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