Math Problem Statement

Solve the following system of equations: x - 4y = -29 and 5x + 2y = 9 using the substitution method.

Solution

The system of equations given in your image is:

x - 4y &= -29 \\ 5x + 2y &= 9 \end{aligned}$$ We are asked to solve this system using the substitution method. ### Step 1: Solve the first equation for $$x$$ From the first equation: $$x - 4y = -29$$ Solve for $$x$$: $$x = 4y - 29$$ ### Step 2: Substitute the expression for $$x$$ into the second equation Now substitute $$x = 4y - 29$$ into the second equation $$5x + 2y = 9$$: $$5(4y - 29) + 2y = 9$$ Expand the equation: $$20y - 145 + 2y = 9$$ Simplify: $$22y - 145 = 9$$ ### Step 3: Solve for $$y$$ Add 145 to both sides: $$22y = 154$$ Now divide by 22: $$y = \frac{154}{22} = 7$$ ### Step 4: Substitute $$y = 7$$ back into the expression for $$x$$ Now substitute $$y = 7$$ into the equation $$x = 4y - 29$$: $$x = 4(7) - 29 = 28 - 29 = -1$$ ### Final Answer: The solution to the system is: $$(x, y) = (-1, 7)$$ Would you like further details or have any questions about this solution? Here are 5 related questions: 1. How would you solve this system using the elimination method? 2. What happens if you solve for $$y$$ first instead of $$x$$? 3. Can you verify this solution by substituting $$x = -1$$ and $$y = 7$$ into both original equations? 4. How would you solve the same system graphically? 5. What if one equation had a nonlinear term (e.g., $$x^2$$)—how would the approach change? **Tip:** Always substitute your final solution back into the original equations to verify it satisfies both!

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Math Problem Analysis

Mathematical Concepts

Linear Algebra
Substitution Method
Systems of Equations

Formulas

x - 4y = -29
5x + 2y = 9

Theorems

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Suitable Grade Level

Grades 9-12