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ss7ja [257]
3 years ago
14

What is the value of x? 7.5/x= 30/16​

Mathematics
2 answers:
hoa [83]3 years ago
7 0

Answer:

4

Step-by-step explanation:

I divided 30/16 and got 1.875, then I knew that 7.5 would have to have the same answer. I did a process of elimination by dividing 7.5 by numbers at random and finally divided by 4 and got the answer. Another way to get the answer would be to cross multiply the equation.

Yakvenalex [24]3 years ago
6 0
X=4

7.5/4=30/16
120=30x
4=x
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3x+5y=-3 x-5y=-5 show your work
frez [133]
We are given the equations 3x+5y=-3 and x-5y=-5.

Both equations have a 5y  term which allows us to easily solve the system by elimination. To do so we will add the equations together like a simple addition problem by adding the x terms together, the y terms together, and the integer answers together.

3x + 5y = -3
+x - 5y = -5
---------------
4x + 0y = -8

The y terms cancel out since one is positive and one is negative. Now we can solve for x.

4x = -8

\frac{4x}{(4)} = \frac{-8}{(4)}

x = -2

Now plug -2 in for x in one of the original equations to find y.

(-2) - 5y = -5

-5y = -3

y = 3/5

Our answer as an ordered pair is (2, 3/5)
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3 years ago
Help please! 10 points!
IgorC [24]

Answer:

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when you cross multiply to solve x, 50x = 1080

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3 years ago
Find the inverse function of f(x)=4x-8
kipiarov [429]

Answer:

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substitute f^-1(x) for y

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