Question
upstudy study bank question image url

Find the solution to the system by the addition (elimination) method. Check your answers. \[ \begin{aligned} 15 x+7 y=14 & \text { (1) } \\ 5 x+4 y=8 & \text { (2) }\end{aligned} \] What is the solution to the system? \( \square \) (Type an ordered pair.)

Ask by Davison Reyes. in the United States
Feb 03,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

The solution to the system is \( (0, 2) \).

Solution

Solve the system of equations \( 15x+7y=14;5x+4y=8 \). Solve the system of equations by following steps: - step0: Solve using the substitution method: \(\left\{ \begin{array}{l}15x+7y=14\\5x+4y=8\end{array}\right.\) - step1: Solve the equation: \(\left\{ \begin{array}{l}x=\frac{14-7y}{15}\\5x+4y=8\end{array}\right.\) - step2: Substitute the value of \(x:\) \(5\times \frac{14-7y}{15}+4y=8\) - step3: Multiply the terms: \(\frac{14-7y}{3}+4y=8\) - step4: Multiply both sides of the equation by LCD: \(\left(\frac{14-7y}{3}+4y\right)\times 3=8\times 3\) - step5: Simplify the equation: \(14+5y=24\) - step6: Move the constant to the right side: \(5y=24-14\) - step7: Subtract the numbers: \(5y=10\) - step8: Divide both sides: \(\frac{5y}{5}=\frac{10}{5}\) - step9: Divide the numbers: \(y=2\) - step10: Substitute the value of \(y:\) \(x=\frac{14-7\times 2}{15}\) - step11: Simplify: \(x=0\) - step12: Calculate: \(\left\{ \begin{array}{l}x=0\\y=2\end{array}\right.\) - step13: Check the solution: \(\left\{ \begin{array}{l}x=0\\y=2\end{array}\right.\) - step14: Rewrite: \(\left(x,y\right) = \left(0,2\right)\) The solution to the system of equations by the addition (elimination) method is \( (x, y) = (0, 2) \).

Reviewed and approved by the UpStudy tutoring team

error msg
Explain
Simplify this solution

Mind Expander

To solve the system of equations using the elimination method, we can first manipulate the two equations to eliminate one of the variables. Starting with the equations: 1. \( 15x + 7y = 14 \) (1) 2. \( 5x + 4y = 8 \) (2) We can multiply the second equation by 3 to align the coefficients of \(x\): \[ 3(5x + 4y) = 3(8) \] This gives us: \[ 15x + 12y = 24 \quad (3) \] Now, we have: 1. \( 15x + 7y = 14 \) (1) 2. \( 15x + 12y = 24 \) (3) Next, we can subtract equation (1) from equation (3): \[ (15x + 12y) - (15x + 7y) = 24 - 14 \] This simplifies to: \[ 5y = 10 \] Dividing both sides by 5 gives us: \[ y = 2 \] Now, we can substitute \(y = 2\) back into one of the original equations to find \(x\). We can use equation (2): \[ 5x + 4(2) = 8 \] This simplifies to: \[ 5x + 8 = 8 \] Subtracting 8 from both sides: \[ 5x = 0 \] Dividing by 5 gives: \[ x = 0 \] Thus, the solution to the system is: \[ \boxed{(0, 2)} \] To check our answers, we can substitute \(x = 0\) and \(y = 2\) back into both original equations: For equation (1): \[ 15(0) + 7(2) = 0 + 14 = 14 \quad \text{(True)} \] For equation (2): \[ 5(0) + 4(2) = 0 + 8 = 8 \quad \text{(True)} \] Both equations are satisfied, confirming our solution is correct.

Try Premium now!
Try Premium and ask Thoth AI unlimited math questions now!
Maybe later Go Premium
Study can be a real struggle
Why not UpStudy it?
Select your plan below
Premium

You can enjoy

Start now
  • Step-by-step explanations
  • 24/7 expert live tutors
  • Unlimited number of questions
  • No interruptions
  • Full access to Answer and Solution
  • Full Access to PDF Chat, UpStudy Chat, Browsing Chat
Basic

Totally free but limited

  • Limited Solution
Welcome to UpStudy!
Please sign in to continue the Thoth AI Chat journey
Continue with Email
Or continue with
By clicking “Sign in”, you agree to our Terms of Use & Privacy Policy