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4 votes
Write an equation that passes through the points (1,8) and (3,4)

User Luis Abreu
by
6.9k points

2 Answers

3 votes
Answer:
y = -2x + 10
Step by step explanation:
The slope-point formula, which is as follows, can be used to determine the equation of the line passing through the points (1, 8) and (3, 4).

y - y1 = m(x - x1) (x - x1)

where (x1, y1) is one point on the line, (x, y), and (m) is the slope of the line.

The following formula is used to determine the line's slope:

m = (y2 - y1) / (x2 - x1) = (4 - 8) / (3 - 1) = -4/2 = -2

Now, we can enter one of the points, let's say (1, 8), together with the slope into the slope-point formula:

y - 8 = -2(x - 1) (x - 1)

By extending the right side, we obtain:

y - 8 = -2x + 2

By adding 8 to both sides, we get:

y = -2x + 10

The line's equation is therefore y = -2x + 10, passing through the points (1, 8) and (3, 4).

Hope it helps! :)
User Flavia Obreja
by
7.3k points
6 votes

Answer:


y = -2x + 10

Explanation:

The slope-intercept form of equation of line:

y = mx + c

where:

m = slope

c = y-intercept

Slope, m:
(y_(2) - y_(1))/(x_(2) -x_(1))

=
(4 - 8)/(3 - 1)

=
-(4)/(2)

=
-2


y = -2x +c

Substitute the coordinates of either of the two points in this equation to calculate the value of c:

8 =
-2(1) + c

8 =
-2 + c

c = 8 + 2

c = 10

Therefore, the equation is:


y = -2x +10

User Jperras
by
7.5k points