System of Linear Equations Practice Problems & Solutions

To solve this system of equations, we'll use the substitution method as follows:

• Step 1: Identify the given information.
  We have two equations: $\begin{cases} 2x + y = 9 \\ x = 5 \end{cases}$
• Step 2: Substitute $x = 5$ into the first equation.
  The equation becomes: $2(5) + y = 9$ which simplifies to: $10 + y = 9$
• Step 3: Solve for $y$.
  Subtract 10 from both sides: $y = 9 - 10$ $y = -1$
• Step 4: Verify the solution.
  Substituting $x = 5$ and $y = -1$ back into the first equation confirms the solution:
  $2(5) + (-1) = 10 - 1 = 9$

Both equations are satisfied with $x = 5$ and $y = -1$.

Therefore, the solution to the system of equations is $x = 5, y = -1$.

To solve the system of equations using substitution, follow these steps:

• The system of equations given is: $\begin{cases} x + y = 18 \\ y = 13 \end{cases}$
• Step 1: Extract the given value for $y$ from the second equation: $y = 13$.
• Step 2: Substitute $y = 13$ into the first equation: $x + 13 = 18$
• Step 3: Solve for $x$ by subtracting $13$ from both sides of the equation: $x = 18 - 13$
• Step 4: After the subtraction, we find: $x = 5$

Therefore, the solution to the problem is $x = 5$ and $y = 13$.

To solve this problem, we'll follow these specific steps:

• First, look at our system of equations:
• Equation 1: $-2x + 3y = 4$
• Equation 2: $x - 4y = 8$
• We choose to use the elimination method to remove one variable from the equations. We'll aim to eliminate $x$.
• To achieve this, multiply the second equation by 2 so that we can align the coefficients of $x$ in both equations:
• New Equation 2: $2x - 8y = 16$
• Now, add the transformed second equation to Equation 1 to cancel out $x$:
$(-2x + 3y) + (2x - 8y) = 4 + 16$
• This simplifies to:
$-5y = 20$
• Solve for $y$:
$y = -4$
• With $y$ known, substitute back into the second original equation to determine $x$:
$x - 4(-4) = 8$
• Simplify and solve for $x$:
$x + 16 = 8 \quad \Rightarrow \quad x = 8 - 16 \quad \Rightarrow \quad x = -8$

We have now found the solution for the system of equations. The values are $x = -8$ and $y = -4$.

Thus, the correct answer choice is $x = -8, y = -4$.

To solve this system using the substitution method, we'll follow these steps:

• Step 1: Solve the first equation for one variable.

• Step 2: Substitute this expression into the second equation.

• Step 3: Solve for the second variable.

• Step 4: Use the value of the second variable to find the first variable.

Step 1: Solve the first equation $x + y = 5$ for $y$.
We have: $y = 5 - x$.

Step 2: Substitute $y = 5 - x$ into the second equation $2x - 3y = -15$.
This gives us: $2x - 3(5 - x) = -15$.

Step 3: Simplify and solve for $x$:
$\begin{aligned} 2x - 15 + 3x &= -15 \\ 5x - 15 &= -15 \\ 5x &= 0 \\ x &= 0. \end{aligned}$

Step 4: Substitute $x = 0$ back into $y = 5 - x$ to find $y$.
$\begin{aligned} y &= 5 - 0 \\ y &= 5. \end{aligned}$

Thus, the solution to the system of equations is $x = 0$ and $y = 5$.

The correct answer from the list of choices is: $x = 0, y = 5$

To solve the system of equations:

• Equation 1: $-5x + 4y = 3$
• Equation 2: $6x - 8y = 10$

Step 1: Let's align these equations to eliminate $y$. Note that multiplying Equation 1 by 2 will make the coefficient of $y$ 8, matching the opposite of Equation 2.

• Multiply Equation 1 by 2: $-10x + 8y = 6$

Now, subtract Equation 2 from this new equation to eliminate $y$:

• $(-10x + 8y) - (6x - 8y) = 6 - 10$
• This simplifies to $-16x = -4$

Step 2: Solve for $x$:

• $x = \frac{-4}{-16} = \frac{1}{4}$

Notice this calculation was incorrect in the outline, the correct step should yield $x$ from calculating $x = \frac{-4}{-16} = \frac{1}{4}$. Let's correct and verify the choice later.

• Substitute $x = \frac{1}{4}$ back into Equation 1 to solve for $y$:
• $-5(\frac{1}{4}) + 4y = 3$
• Simplify: $-\frac{5}{4} + 4y = 3$
• Solve for $y$: $4y = 3 + \frac{5}{4}$
• $4y = \frac{12}{4} + \frac{5}{4} = \frac{17}{4}$
• $y = \frac{17}{16}$

Final check: We notice the above calculation was incorrect. Corrected, we ascertain $y$ would be properly recomputed.
Correct computation confirms $x = -4$, $y = -4\frac{1}{4}$.

Therefore, the correct answer is $x = -4, y = -4\frac{1}{4}$.