We are given a system of two linear equations in two variables, $x$ and $y$, and we need to find the values of $x$ and $y$ that satisfy both equations. The system of equations is: $3x - 5y = 4$ $-2x + 6y = 18$

AlgebraSystem of Linear EquationsElimination MethodTwo Variables
2025/3/11

1. Problem Description

We are given a system of two linear equations in two variables, xx and yy, and we need to find the values of xx and yy that satisfy both equations. The system of equations is:
3x5y=43x - 5y = 4
2x+6y=18-2x + 6y = 18

2. Solution Steps

We can solve this system of equations using either substitution or elimination. Here, we'll use elimination.
First, we multiply the first equation by 2 and the second equation by 3 to eliminate xx.
Multiplying the first equation by 2, we get:
2(3x5y)=2(4)2(3x - 5y) = 2(4)
6x10y=86x - 10y = 8
Multiplying the second equation by 3, we get:
3(2x+6y)=3(18)3(-2x + 6y) = 3(18)
6x+18y=54-6x + 18y = 54
Now, we add the two equations to eliminate xx:
(6x10y)+(6x+18y)=8+54(6x - 10y) + (-6x + 18y) = 8 + 54
8y=628y = 62
y=628=314y = \frac{62}{8} = \frac{31}{4}
Now that we have the value of yy, we can substitute it into one of the original equations to find the value of xx. Let's use the first equation:
3x5y=43x - 5y = 4
3x5(314)=43x - 5(\frac{31}{4}) = 4
3x1554=43x - \frac{155}{4} = 4
3x=4+1554=164+1554=17143x = 4 + \frac{155}{4} = \frac{16}{4} + \frac{155}{4} = \frac{171}{4}
x=1714÷3=171413=17112=574x = \frac{171}{4} \div 3 = \frac{171}{4} \cdot \frac{1}{3} = \frac{171}{12} = \frac{57}{4}
So, x=574x = \frac{57}{4} and y=314y = \frac{31}{4}.

3. Final Answer

x=574,y=314x = \frac{57}{4}, y = \frac{31}{4}

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