katlin95
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)
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katlin95
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@jim_thompson5910 i stuck
JayDS
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Hint: You can cross multiply here.
jim_thompson5910
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when you cross multiply 2/3=3/y what do you get?
katlin95
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no solution
jim_thompson5910
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a/b = c/d
cross multiplies to
a*d = b*c
katlin95
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y =9/2
jim_thompson5910
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dont' completely solve for y though
jim_thompson5910
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just do this first step of cross multiplication
katlin95
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2y=9
jim_thompson5910
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better, but that 9 can be written as what
katlin95
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9x
jim_thompson5910
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9 = 9*1
9 = something * something
what goes in the place of "something" ?
katlin95
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2y= (3)(3)
jim_thompson5910
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you got it
katlin95
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Which of the following is equivalent to the proportion
3/4=x/12
jim_thompson5910
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I'm assuming there are choices
post them please and tell me which one you got
katlin95
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A. 4/3= 12/x
B. 3/4= 12/x
C. 4/3= x/12
D. 4/12= x/3
jim_thompson5910
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which one did you get
jim_thompson5910
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hint:
if
a/b = c/d
then you can flip both sides to get the equivalent equation
b/a = d/c
katlin95
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A right?
jim_thompson5910
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good, you got it
katlin95
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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!:)
jim_thompson5910
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B is incorrect
jim_thompson5910
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a/b = c/d
cross multiplies to
a*d = b*c
katlin95
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1/3=y/26
26=3y
jim_thompson5910
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good, you got it, so that's close to 3(y) = 1(26)
you just have to factor and flip the equation
katlin95
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so our answer would be D then
jim_thompson5910
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correct
katlin95
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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
katlin95
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I think its B
jim_thompson5910
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solve for x
6/20 = 4/x
katlin95
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x=40/3
katlin95
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?
jim_thompson5910
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which is x = 13.333 in decimal form
round this to the nearest whole number to get x = 13
katlin95
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so our answer is 13
jim_thompson5910
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you got it