A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 one year ago
Suppose y varies directly with x, and y = 10 when x = –3. What direct variation equation relates x and y? What is the value of y when x = –1?
A : y = –x;
B : y = x; –
C :y = x; –
D : y = –x;
Can somebody explain to me how to do this?
 one year ago
Suppose y varies directly with x, and y = 10 when x = –3. What direct variation equation relates x and y? What is the value of y when x = –1? A : y = –x; B : y = x; – C :y = x; – D : y = –x; Can somebody explain to me how to do this?

This Question is Closed

SamuelAlden917
 one year ago
Best ResponseYou've already chosen the best response.1In this scenario, you need to understand what it means when y varies directly with x. Since they vary directly, as x increases, so does y. The proportion, also known as factor, stays constant no matter what you plug into x. This is fit by the following equation: y=x In other words, if you plug 5 into x, y should always no matter what be three times larger than x (just an example). To solve this scenario, you need to find a proportion to use with your y = x formula. You can find the proportion by dividing y=72 by x=6. 72/6=12 Now, to use 12 in the formula. Remember that y is 12 times larger than x when you plug a number for x, so to make y larger, multiply 12 and x. y=12x let(x)→6 Plug 6 into x. Therefore, y = 72 when x = 6. y=12(6)=72

cheyyyboo
 one year ago
Best ResponseYou've already chosen the best response.1very much, thank you (:
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.