Writing an Equation

You can use an equation to represent an algebraic relationship.

The input or independent variable represents the x-values.

The output or dependent variable represents the y-values.

An equation represents the relationship between the independent and the dependent quantities.

y = mx +b

• m = slope

• b = y -intercept of the line

What is the equation of the line?

What is the equation of the line?

Write down each piece of information on your white board! You'll need it for the next couple questions!

Write down each piece of information on your white board! You'll need it for the next question!

Write down each piece of information on your white board! You'll need it for the next question!

Identify the slope and y-intercept from the linear equation: y = 4x - 2

• Slope (m) =

• y-intercept (b) =

LInear Equations

Unit 5

#1 Identify the slope and y-intercept from equation and graph

#2 Write the equation for a line in slope-intercept form

Slope from slope-intercept form

If the equation is in slope-intercept form (solved for y), then the slope is the number IN FRONT OF the x. NOT the x.

Example: y = mx + b, m is the slope. NOT mx.

mx + b = y, m is still the slope.

Parallel Slopes

In order for two lines to be parallel, the slopes of their equations must be the same.