Math Problem Statement

Solve the system of equations: y = 2x + 28 and y = 9x.

Solution

The image shows a system of linear equations:

y &= 2x + 28 \\ y &= 9x \end{aligned}$$ To solve this system, we can use the substitution method since both equations are already solved for $$y$$. ### Step 1: Set the equations equal to each other Since $$y = 2x + 28$$ and $$y = 9x$$, we can set them equal: $$2x + 28 = 9x$$ ### Step 2: Solve for $$x$$ Subtract $$2x$$ from both sides: $$28 = 7x$$ Now, divide both sides by 7: $$x = 4$$ ### Step 3: Solve for $$y$$ Substitute $$x = 4$$ back into either equation (we'll use $$y = 9x$$): $$y = 9(4) = 36$$ ### Final Answer The solution to the system of equations is: $$x = 4, \quad y = 36$$ Would you like more details or have any questions? Here are 5 related questions you might find helpful: 1. How can we solve a system of equations using the elimination method? 2. What is the graphical interpretation of solving a system of linear equations? 3. How do you solve systems of equations where one equation is quadratic and the other is linear? 4. What are the conditions for a system of linear equations to have no solution? 5. How can matrices be used to solve a system of linear equations? **Tip:** When solving systems of linear equations, always check if substitution or elimination is more convenient based on how the equations are presented.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Systems of Equations

Formulas

Substitution method for solving systems of equations

Theorems

Equality of equations when substituting

Suitable Grade Level

Grades 8-10