The problem is to solve the system of linear equations: $ -4x + 5y = 32 $ $ -3x + 4y = 25 $

AlgebraLinear EquationsSystems of EquationsElimination MethodSolving Equations
2025/6/4

1. Problem Description

The problem is to solve the system of linear equations:
4x+5y=32 -4x + 5y = 32
3x+4y=25 -3x + 4y = 25

2. Solution Steps

We can solve this system using the elimination method.
First, multiply the first equation by 3 and the second equation by -4 to eliminate xx:
3(4x+5y)=3(32)3(-4x + 5y) = 3(32)
12x+15y=96-12x + 15y = 96
4(3x+4y)=4(25)-4(-3x + 4y) = -4(25)
12x16y=10012x - 16y = -100
Now add the two new equations:
(12x+15y)+(12x16y)=96+(100)(-12x + 15y) + (12x - 16y) = 96 + (-100)
y=4-y = -4
y=4y = 4
Substitute y=4y = 4 into the first equation:
4x+5(4)=32-4x + 5(4) = 32
4x+20=32-4x + 20 = 32
4x=3220-4x = 32 - 20
4x=12-4x = 12
x=3x = -3

3. Final Answer

x=3x = -3, y=4y = 4
The solution is (3,4)(-3, 4).

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