Ch. 5 - Systems and Matrices

Lial13th EditionCollege AlgebraISBN: 9780136881063Not the one you use?Change textbook

Lial 13th Edition

Ch. 5 - Systems and Matrices

Problem 8

Chapter 6, Problem 8

Verify that the points of intersection specified on the graph of each nonlinear system are solutions of the system by substituting directly into both equations.
2x² = 3y + 23
y = 2x - 5

Verified step by step guidance

Identify the system of equations: $2x^2 = 3y + 23$ and $y = 2x - 5$.

Substitute the $y$ value from the second equation into the first equation to verify the points: replace $y$ with $2x - 5$ in $2x^2 = 3y + 23$ to get $2x^2 = 3(2x - 5) + 23$.

Check the point $(0, -1)$ by substituting $x = 0$ and $y = -1$ into both equations: verify if $2(0)^2 = 3(-1) + 23$ and if $-1 = 2(0) - 5$ hold true.

Check the point $(3, 6)$ by substituting $x = 3$ and $y = 6$ into both equations: verify if $2(3)^2 = 3(6) + 23$ and if $6 = 2(3) - 5$ hold true.

If both points satisfy both equations, then they are solutions to the system, confirming the points of intersection on the graph.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.

Video duration:

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

System of Nonlinear Equations

A system of nonlinear equations consists of two or more equations involving variables where at least one equation is nonlinear, such as quadratic. Solutions are points where the graphs of the equations intersect, satisfying all equations simultaneously.

Substitution Method

The substitution method involves replacing one variable with an expression from another equation to verify if a point satisfies both equations. This method is useful for checking if given points are solutions to the system by direct substitution.

Graphical Interpretation of Solutions

The points of intersection on the graph represent solutions to the system of equations. Each intersection point's coordinates satisfy both equations, providing a visual confirmation of the solutions.

Recommended video:

4:27

Introduction to Systems of Linear Equations

Related Practice

Textbook Question

Solve each system by substitution.

x - 5y = 8

x = 6y

views

Textbook Question

Find the dimension of each matrix. Identify any square, column, or row matrices.

$[\begin{matrix} - 6 & 8 & 0 & 0 \\ 4 & 1 & 9 & 2 \\ 3 & - 5 & 7 & 1 \end{matrix}]$

views

Textbook Question

Use the substitution or elimination method to solve each system of equations. Identify any inconsistent systems or systems with infinitely many solutions. If a system has infinitely many solutions, write the solution set with y arbitrary.

6x + 10y = -11

9x + 6y = -3

views

Textbook Question

Find the dimension of each matrix. Identify any square, column, or row matrices.

$[\begin{matrix} - 9 & 6 & 2 \\ 4 & 1 & 8 \end{matrix}]$