In Exercises 5–18, solve each system by the substitution method. 2x - 3y = 8 - 2x 3x + 4y = x + 3y + 14
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7. Systems of Equations & Matrices
Two Variable Systems of Linear Equations
Problem 17
Textbook Question
Solve each system by substitution.
3y = 5x + 6
x + y = 2
Verified step by step guidance1
Start with the given system of equations: \$3y = 5x + 6\( and \)x + y = 2$.
Solve one of the equations for one variable. For example, solve the second equation for \(y\): \(y = 2 - x\).
Substitute the expression for \(y\) from the second equation into the first equation: \$3(2 - x) = 5x + 6$.
Simplify and solve the resulting equation for \(x\): distribute the 3 and combine like terms to isolate \(x\).
Once you find the value of \(x\), substitute it back into \(y = 2 - x\) to find the corresponding value of \(y\).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
System of Linear Equations
A system of linear equations consists of two or more linear equations with the same set of variables. The goal is to find values for the variables that satisfy all equations simultaneously. In this problem, the system involves two equations with variables x and y.
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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. After finding one variable, substitute back to find the other.
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Solving Linear Equations
Solving linear equations means isolating the variable to find its value. This often involves operations like addition, subtraction, multiplication, division, and simplifying expressions. Accurate manipulation is essential to correctly solve for variables in the system.
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