Answered

At Westonci.ca, we make it easy for you to get the answers you need from a community of knowledgeable individuals. Our platform offers a seamless experience for finding reliable answers from a network of experienced professionals. Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform.

show that (20,15) is a solution to the system of equations.
5x-2y=70
3x+4y=120

Sagot :

konrad509
[tex]5\cdot20-2\cdot15=70\\ 100-30=70\\ 70=70\leftarrow \text{ true}\\\\ 3\cdot20+4\cdot15=120\\ 60+60=120\\ 120=120\leftarrow \text{ true}[/tex]
eu99li

{5x-2y=70    /*2

{3x+4y=120

___________________

{10x-4y=140

{3x+4y=120        (+)

13x=260   /:13

x=20

3x+4y=120

3*20+4y=120

4y=120-60

4y=60   /:4

y=15

So the solution is (20; 15)

We appreciate your time on our site. Don't hesitate to return whenever you have more questions or need further clarification. Thank you for visiting. Our goal is to provide the most accurate answers for all your informational needs. Come back soon. We're glad you visited Westonci.ca. Return anytime for updated answers from our knowledgeable team.