quick question to have answered?

Question

what is the equation of the line that passes through the points (3, -2) and (7,-2). its the last question and i have no clue how to do it.

Answer 1

Two point slope formula
m = (y_2 - y_1)/ (x_2 - x_1)

One point slope formula
y = mx + c

Use two point slope formula to calculate slope
m = (y_2 - y_1)/ (x_2 - x_1)
m = (-2 - (-2)) / (3 - 7) = 0

y = mx + c
since m = 0
y = c
You can use any point to solve for y
y = -2

So the equation is y = -2
The line is parallel to the x axis (horizontal line)

Answer 2

This is a horizontal line (ie slope = 0)
Equation is y = - 2
(all points on this line lie 2 units below the x axis)

Answer 3

In order to find the equation of a line you need two pieces of info:

1. A point on the line
2. the Slope or gradient of the line.

Two point slope formula
m = (y2 - y1)/ (x2 - x1)

One point slope formula
y = mx + c, where c is the intercept on the x-axis

Use two point slope formula to calculate slope
m = (y2 - y1)/ (x2 - x1)
m = (-2 - (-2)) / (3 - 7) = 0/-4
=0

therefore slope is zero

y=mx+c and the intercept is -2

equation is -2

Answer 4

the slope 0 then y+2/x -3= 0 then y=-2 or y+2=0 is the equin_

Answer 5

Firstly, find the gradient first.

Gradient
= (-2-(-2)) / (7-3)
=0

Next substitude into the formula

y1 - y2= m (x1 - x2)
y - (-2) = 0 (x - 7)
y+2=0
y = -2

hope you understand.

Answer 6

y = -2 simple!!,just plot the points in a graph,you 'll find the line parallel to the x- axis, the equation of a line parralel to x-axis is y = the constant ,in this case its -2,so y = -2.the same will be for x axis.

Answer 7

y = -2

Notice that the y coordinate has not changed at all. In a straight line if one coordinate does not change between two points, it won't change ever.

Answer 8

Since y does not change and x does change, y=-2 is your answer.