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Elena-2011 [213]
3 years ago
9

Write the equation of the line that passes through the points (3,4) and (1,5)

Mathematics
2 answers:
Illusion [34]3 years ago
8 0
Hi,

y=  -\frac{1}{2} x+b



Nostrana [21]3 years ago
3 0
Given points
(x₁,y₁) = (3,4)
(x₂,y₂) = (1,5)

FIRST
Find the slope of the line. This is general formula to determine the slope
m = (y₂ - y₁)/(x₂ - x₁)

Plug in the numbers to the formula
m = (y₂ - y₁)/(x₂ - x₁)
m = (5 - 4)/(1 - 3)
m = 1/(-2)
m = -1/2

SECOND
Determine the line equation
This is general formula to determine the line equation
y - y₁ = m(x - x₁)

Plug in the numbers
y - 4 = -1/2 (x - 3)
y - 4 = (-1/2)x + 3/2
y = (-1/2)x + 3/2 + 4
y = (-1/2)x + 11/2
(this is the equation of the line)
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