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gm2
02.10.2019 •
Mathematics
Aline passes (2,-1) and (4,-5). which is the equation of the line?
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Ответ:
y= -2x + 3
Step-by-step explanation:
y-y1 = m(x-x1)
-5-(-1) = m(4-2)
-5+1 = m (2)
-4 = 2m
-4/2 = m
m= -2
Hence, your slope is -2.
But we still need the y-intercept to find the equation.
Hence, use one of the points and the slope to determine the y-int.
y=mx+b
-1 = -2(2) + b
-1 = -4 +b
-1+4 = b
b = 3
Hence the equation of the line is:
y= -2x+3
Hope this helps!
Ответ:
2÷2=1