In Exercises 5–18, solve each system by the substitution method. {x=4y−2x=6y+8\begin{cases} x = 4y - 2 \\ x = 6y + 8 \end{cases}{x=4y−2x=6y+8

Ch. 5 - Systems of Equations and Inequalities

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Blitzer 8th Edition

Ch. 5 - Systems of Equations and Inequalities

문제 9

6장, 문제 9

In Exercises 5–18, solve each system by the substitution method. $\begin{cases}\) x = 4y - 2 \\ x = 6y + 8 \(\end{cases}$

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Since both equations are equal to $x$, set the right-hand sides of the equations equal to each other: $4y - 2 = 6y + 8$.

Next, solve the equation $4y - 2 = 6y + 8$ for $y$. Start by subtracting \$4y$ from both sides to get $-2 = 2y + 8$.

Then, subtract 8 from both sides to isolate the term with $y$: $-2 - 8 = 2y$, which simplifies to $-10 = 2y$.

Divide both sides by 2 to solve for $y$: $y = \frac{-10}{2}$.

Finally, substitute the value of $y$ back into either original equation (for example, $x = 4y - 2$) to find the corresponding value of $x$.

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주요 개념

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System of Linear Equations

A system of linear equations consists of two or more linear equations with the same variables. The solution is the set of variable values that satisfy all equations simultaneously. Understanding how to interpret and represent these systems is fundamental to solving them.

Substitution Method

The substitution method involves solving one equation for one variable and then substituting that expression into the other equation. This reduces the system to a single equation with one variable, making it easier to solve. It is especially useful when one variable is already isolated.

Solving Linear Equations

Solving linear equations means finding the value(s) of the variable(s) that make the equation true. This often involves simplifying expressions, isolating variables, and performing arithmetic operations. Mastery of these skills is essential for solving systems effectively.

In Exercises 5–18, solve each system by the substitution method. {x=4y−2x=6y+8\(\begin{cases}\) x = 4y - 2 \\ x = 6y + 8 \(\end{cases}\){x=4y−2x=6y+8