Solve the System of Linear Equations: 6x - 2y = 24 and x + 5y = 4

6x2y=24 6x-2y=24

x+5y=4 x+5y=4

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Step-by-step video solution

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00:00 Solve
00:04 Let's multiply one of the equations by 6, so we can subtract between them
00:14 Now let's subtract between the equations
00:19 Let's reduce what we can
00:29 Let's group terms
00:34 Let's isolate Y
00:39 This is the value of Y
00:44 Now let's substitute Y to find the value of X
00:51 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

6x2y=24 6x-2y=24

x+5y=4 x+5y=4

2

Step-by-step solution

To solve this problem, we'll begin with the system of equations:

6x2y=24(Equation 1)x+5y=4(Equation 2) \begin{aligned} & 6x - 2y = 24 \quad \text{(Equation 1)} \\ & x + 5y = 4 \quad \text{(Equation 2)} \end{aligned}

We will use the elimination method to solve for x x and y y . First, let's align the equations to eliminate y y .

We notice that if we multiply Equation 2 by 2, it becomes easier to align coefficients with Equation 1:

2(x+5y)=2×4 2(x + 5y) = 2 \times 4

Simplifying gives:

2x+10y=8(Equation 3) 2x + 10y = 8 \quad \text{(Equation 3)}

Now, we have:

6x2y=242x+10y=8 \begin{aligned} & 6x - 2y = 24 \\ & 2x + 10y = 8 \\ \end{aligned}

To eliminate y y , let's add the equations after aligning coefficients. Multiply Equation 1 by 5 and Equation 3 by 1 to eliminate y y :

5(6x2y)=5(24)1(2x+10y)=1(8) \begin{aligned} 5(6x - 2y) &= 5(24) \\ 1(2x + 10y) &= 1(8) \\ \end{aligned}

Which gives:

30x10y=1202x+10y=8 \begin{aligned} 30x - 10y &= 120 \\ 2x + 10y &= 8 \end{aligned}

Adding these:

(30x10y)+(2x+10y)=120+8 (30x - 10y) + (2x + 10y) = 120 + 8

32x=128 32x = 128

Solving for x x , we divide by 32:

x=12832=4 x = \frac{128}{32} = 4

Substitute x=4 x = 4 back into Equation 2:

4+5y=4 4 + 5y = 4

Subtract 4 on both sides:

5y=0 5y = 0

Dividing by 5 gives:

y=0 y = 0

Thus, we have determined the solution to the system of equations:

x=4,y=0 x = 4, y = 0 .

3

Final Answer

x=4,y=0 x=4,y=0

Practice Quiz

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\( \begin{cases} 2x + y = 10 \\ x-y=2 \end{cases} \)

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