# What Are The Three Equations Of A Line?

## What does an equation with 3 variables define?

A solution of a system of equations in three variables is an ordered triple (x,y,z) ( x , y , z ) , and describes a point where three planes intersect in space.

Solving the system by elimination results in a single ordered triple (x,y,z) ( x , y , z ) ..

## What is B in the equation of a line?

The equation of any straight line, called a linear equation, can be written as: y = mx + b, where m is the slope of the line and b is the y-intercept. The y-intercept of this line is the value of y at the point where the line crosses the y axis.

## Can 2 equations solve 3 variables?

Equations with two variables require two equations to have a unique solution (one ordered pair). So it should not be a surprise that equations with three variables require a system of three equations to have a unique solution (one ordered triplet).

## What does the M stand for in Y MX C?

y = mx + c is an important real-life equation. The gradient, m, represents rate of change (eg, cost per concert ticket) and the y-intercept, c, represents a starting value (eg, an admin.

## How do you find the equation of a line with 3 points?

2 AnswersGet two different vectors which are in the plane, such as B−A=(3,0,−3) and C−A=(3,3,3).Compute the cross product of the two obtained vectors: (B−A)×(C−A)=(9,−18,9). This is the normal vector of the plane, so we can divide it by 9 and get (1,−2,1).The equation of the plane is thus x−2y+z+k=0.

## How do you find the equation of a line given two points?

Equation from 2 points using Slope Intercept FormCalculate the slope from 2 points.Substitute either point into the equation. You can use either (3,7) or (5,11)Solve for b, which is the y-intercept of the line.Substitute b, -1, into the equation from step 2.

## How do I find the slope of the line?

To find the slope, you divide the difference of the y-coordinates of 2 points on a line by the difference of the x-coordinates of those same 2 points .

## What is the Y intercept in an equation?

The y -intercept of a graph is the point where the graph crosses the y -axis. When the equation of a line is written in slope-intercept form ( y=mx+b ), the y -intercept b can be read immediately from the equation. …

## What is the equation of this graphed line?

To find the equation of a graphed line, find the y-intercept and the slope in order to write the equation in y-intercept (y=mx+b) form. Slope is the change in y over the change in x. Find two points on the line and draw a slope triangle connecting the two points.

## What are the equations of a line?

Perhaps the most familiar form of a linear equation is slope-intercept form written as y=mx+b y = m x + b , where m=slope and b=y-intercept .

## What does an equation of a line mean?

Definition: A straight line on the coordinate plane can be described by the equation. y = mx+b. where m is the slope of the line and b is the intercept.

## What is a straight line called?

A line is sometimes called a straight line or, more archaically, a right line (Casey 1893), to emphasize that it has no “wiggles” anywhere along its length. … Two lines lying in the same plane that do not intersect one another are said to be parallel lines.

## What does the M stand for in Y MX B?

slopeIn the equation y = mx + b for a straight line, the number m is called the slope of the line. Definition 2. In the equation y = mx + b for a straight line, the. number b is called the y-intercept of the line. Page 9.

## What is the Y intercept in the equation y =- 2x 5?

In this equation, y = 2x – 5, it is already in that form and so the cumber in front of the x is the slope (2) and the constant number is the y-intercept (-5) – it’s negative because of the minus sign in front of the number. So, the slope is 2 and the y-intercept is -5.

## What is slope intercept form example?

y = 5x + 3 is an example of the Slope Intercept Form and represents the equation of a line with a slope of 5 and and a y-intercept of 3. y = −2x + 6 represents the equation of a line with a slope of −2 and and a y-intercept of 6.

## What are the equations of a straight line?

The general equation of a straight line is y = m x + c , where is the gradient and the coordinates of the y-intercept.

## How do ants move in a straight line?

The ants walk in a straight line because they follow the scent the leader left behind. Once the ants find food and head back to the nest, they will lay down another trail of pheromones, allowing others to pick up their scent and follow the same route. Bumping into each other is another way ants correspond.

## What is y mx b used for?

Slope-intercept form, y=mx+b, of linear equations, emphasizes the slope and the y-intercept of the line.