katlin95 2 years ago Which of the following is equivalent to the proportion 2/3=3/y? A. 3y = (2)(3) B. 2y = (2)(3) C. 2y = (3)(3) D. 3y = (3)(3)

1. katlin95

@jim_thompson5910 i stuck

2. JayDS

Hint: You can cross multiply here.

3. jim_thompson5910

when you cross multiply 2/3=3/y what do you get?

4. katlin95

no solution

5. jim_thompson5910

a/b = c/d cross multiplies to a*d = b*c

6. katlin95

y =9/2

7. jim_thompson5910

dont' completely solve for y though

8. jim_thompson5910

just do this first step of cross multiplication

9. katlin95

2y=9

10. jim_thompson5910

better, but that 9 can be written as what

11. katlin95

9x

12. jim_thompson5910

9 = 9*1 9 = something * something what goes in the place of "something" ?

13. katlin95

2y= (3)(3)

14. jim_thompson5910

you got it

15. katlin95

Which of the following is equivalent to the proportion 3/4=x/12

16. jim_thompson5910

I'm assuming there are choices post them please and tell me which one you got

17. katlin95

A. 4/3= 12/x B. 3/4= 12/x C. 4/3= x/12 D. 4/12= x/3

18. jim_thompson5910

which one did you get

19. jim_thompson5910

hint: if a/b = c/d then you can flip both sides to get the equivalent equation b/a = d/c

20. katlin95

A right?

21. jim_thompson5910

good, you got it

22. katlin95

What is the first step that you have to do in order to solve the proportion: 1/3=y/26 A. 8.5 B. 26y = 3 C. y = 3(26) D. 3(y) = 1(26) I got B!:)

23. jim_thompson5910

B is incorrect

24. jim_thompson5910

a/b = c/d cross multiplies to a*d = b*c

25. katlin95

1/3=y/26 26=3y

26. jim_thompson5910

good, you got it, so that's close to 3(y) = 1(26) you just have to factor and flip the equation

27. katlin95

so our answer would be D then

28. jim_thompson5910

correct

29. katlin95

When movies are being created, the set designers often use miniature models before they create the actual movie set. The set designers for Jurassic Park 3, created a 6 inch high and 4 inch long model dinosaur that represented a 20 feet high dinosaur on the set. How long was the actual dinosaur, rounded to the nearest foot? A. 15 feet B. 13 feet C. 14 feet D. 12 feet

30. katlin95

I think its B

31. jim_thompson5910

solve for x 6/20 = 4/x

32. katlin95

x=40/3

33. katlin95

?

34. jim_thompson5910

which is x = 13.333 in decimal form round this to the nearest whole number to get x = 13

35. katlin95