The problem is to solve the following system of linear equations: $2x + 7y = 22$ $5x + 8y = 17$ We need to determine if there is a unique solution, infinitely many solutions, or no solution. If there is a unique solution, we need to find the ordered pair $(x, y)$.

AlgebraLinear EquationsSystems of EquationsElimination MethodSubstitution MethodSolution of Equations
2025/3/17

1. Problem Description

The problem is to solve the following system of linear equations:
2x+7y=222x + 7y = 22
5x+8y=175x + 8y = 17
We need to determine if there is a unique solution, infinitely many solutions, or no solution. If there is a unique solution, we need to find the ordered pair (x,y)(x, y).

2. Solution Steps

We can use the method of substitution or elimination to solve the system of equations. Let's use elimination.
Multiply the first equation by 5 and the second equation by 2 to eliminate xx.
5(2x+7y)=5(22)5(2x + 7y) = 5(22) => 10x+35y=11010x + 35y = 110
2(5x+8y)=2(17)2(5x + 8y) = 2(17) => 10x+16y=3410x + 16y = 34
Subtract the second modified equation from the first modified equation:
(10x+35y)(10x+16y)=11034(10x + 35y) - (10x + 16y) = 110 - 34
10x+35y10x16y=7610x + 35y - 10x - 16y = 76
19y=7619y = 76
y=7619=4y = \frac{76}{19} = 4
Now substitute y=4y = 4 into the first equation 2x+7y=222x + 7y = 22:
2x+7(4)=222x + 7(4) = 22
2x+28=222x + 28 = 22
2x=22282x = 22 - 28
2x=62x = -6
x=62=3x = \frac{-6}{2} = -3
So, the solution is x=3x = -3 and y=4y = 4. The ordered pair is (3,4)(-3, 4).
We can check the solution in the second equation:
5x+8y=175x + 8y = 17
5(3)+8(4)=15+32=175(-3) + 8(4) = -15 + 32 = 17. This is correct.

3. Final Answer

The solution to the system is (3,4)(-3, 4).

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