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Graphing and Writing Linear Functions
SOLVING EQUATIONS INVOLVING RATIONAL EXPONENTS
Linear Equations and Graphing
Systems of Linear Equations
Solving Polynomial Equations
Matrix Equations and Solving Systems of Linear Equations
Introduction Part II and Solving Equations
Linear Algebra
Graphing Linear Inequalities
Using Augmented Matrices to Solve Systems of Linear Equations
Solving Linear Inequalities
Solution of the Equations
Linear Equations
Annotated Bibliography of Linear Algebra Books
Write Linear Equations in Standard Form
Graphing Linear Inequalities
Introduction to Linear Algebra for Engineers
Solving Quadratic Equations
THE HISTORY OF SOLVING QUADRATIC EQUATIONS
Systems of Linear Equations
Review for First Order Differential Equations
Systems of Nonlinear Equations & their solutions
LINEAR LEAST SQUARES FIT MAPPING METHOD FOR INFORMATION RETRIEVAL FROM NATURAL LANGUAGE TEXTS
Quadratic Equations
Syllabus for Differential Equations and Linear Alg
Linear Equations and Matrices
Solving Linear Equations
Slope-intercept form of the equation
Linear Equations
DETAILED SOLUTIONS AND CONCEPTS QUADRATIC EQUATIONS
Linear Equation Problems
Systems of Differential Equations
Linear Algebra Syllabus
Quadratic Equations and Problem Solving
LinearEquations
The Slope-Intercept Form of the Equation
Final Exam for Matrices and Linear Equations
Linear Equations
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Write Linear Equations in Standard Form

Goal • Use point-slope form to write equations in
standard form.


Example 1 Write Linear Equations in Standard Form


Write two equations in standard form that are
equivalent to 4x + 2y = 12.

Solution
To write one equivalent equation, multiply each side
by 0.5 .
2x + y = 6
To write another equivalent equation, multiply each side
by 2 .
8x + 4y = 24

√Guided Practice Complete the following exercises.
1. Write two equations in standard form that are
equivalent to 6x - 4y = 6.
3x - 2y = 3; 12x - 8y = 12


2. Write two equations in standard form that are
equivalent to -12x + 6y = 29.
-4x + 2y = 23; -24x + 12y = -18

Example 2 Write an equation from a graph

Write an equation in standard form of the line shown.

Solution
Step 1 Calculate
the slope.

Step 2 Write an equation in point-slope form.
Use the point (2, 4).

Write point-slope form.
Substitute 4 for y1,
-2 for m, and 2
for x1.

Step 3 Rewrite the equation in standard form.

Simplify.
Collect variable terms on one
side, constants on the other.

√Guided Practice Complete the following exercise.

3. Write an equation in standard form of the line
through (3, -1) and (2, -4).

y - 3x = -10

Example 3 Write an equation of a line

Write an equation of the specified line.

a. Line A

b. Line B

Solution

a. Line A is a vertical line, so
all points on the line have an
x-coordinate of 3. An
equation of the line is x = 3.

b. Line B is a horizontal line, so all points on the line
have a y-coordinate of -6. An equation of the line is
y = -6.

Example 4 Complete an equation in standard form

Find the unknown coefficient in the equation of the line
shown. Write the completed equation.

Solution

Step 1 Find the value of A. Substitute the coordinates of
the given point for x and y in the equation. Solve
for A.

Write equation.


Substitute 2 for x and
1 for y.


Simplify.
Subtract 5 from each side.
Divide by 2 .

 

Step 2 Complete the equation.
-4 x + 5y 5 -3 Substitute -4 for A.

√Guided Practice Complete the following exercise.

4. Write equations of the horizontal and vertical lines
that pass through (-10, 5).
Horizontal: y = 5; Vertical: x = -10

5. Find the missing coefficient in the equation of
the line that passes through (-2, 2). Write the
completed equation.
6x + By = 4
B = 8; 6x + 8y = 4