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Verify if (2, 8) is a Solution to the Linear System $\\begin{cases} x + y = 10 \\\\ 2x + 3y = 28 \\end{cases}$
Mathematics
Grade 8 (Junior High School)
Question Content
Test the given solution (2, 8) to confirm it works for the system: $\begin{cases} x + y = 10 \\ 2x + 3y = 28 \end{cases}$
Correct Answer
The solution (2, 8) is valid for the system of equations.
Detailed Solution Steps
1
Step 1: Identify the values from the solution: $x = 2$, $y = 8$.
2
Step 2: Substitute into the first equation $x + y = 10$: $2 + 8 = 10$, which simplifies to $10 = 10$. This is a true statement, so the solution satisfies the first equation.
3
Step 3: Substitute into the second equation $2x + 3y = 28$: $2(2) + 3(8) = 4 + 24 = 28$, which simplifies to $28 = 28$. This is a true statement, so the solution satisfies the second equation.
4
Step 4: Since the solution satisfies both equations in the system, it is a valid solution.
Knowledge Points Involved
1
Solution Verification for Systems of Linear Equations
This refers to substituting the given ordered pair (x, y) into each equation in the system. If the substitution results in a true mathematical statement for every equation, the ordered pair is a valid solution to the system. It is used to confirm if a proposed solution solves the entire system, not just one equation.
2
Substitution Property of Equality
This property states that if two quantities are equal, one can replace the other in any expression without changing the truth value of the expression. It is the foundational rule that allows substituting x and y values from a solution into the equations of a system.
3
Systems of Two Linear Equations in Two Variables
A set of two linear equations that share the same two variables (usually x and y). A solution to the system is an ordered pair that satisfies both equations simultaneously, representing the intersection point of the two lines when graphed.
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