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Sliva [168]
3 years ago
5

What is the equation and the answer?

Mathematics
1 answer:
Nastasia [14]3 years ago
7 0

Answer:

30

Step-by-step explanation:

So we begin by assigning variables to each side with:

DE = x

EF = y

DF = z

Now we start listing a system of equations from what is given:

x+y+z=81

x=2y

x-4=z

Once we solve that with substitution, we get the result of:

x=34

y=17

z=30.

Since z is the length of DF, the length of DF is 30.

I hope this helped! :D

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Find the value of x if B is the midpoint of AC, AB = 2x + 9 and BC = 37.
Leno4ka [110]

Answer:

14

Step-by-step explanation:

B is the midpoint of AC, in other words it is the halfway point.

So A to B should be equal to B to C

Our expression is:

2x + 9 = 37

Subtract 9

2x = 28

Divide by 2

x = 14

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Answer:

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Step-by-step explanation:

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I'm not the best at explaining but you can search google to get the better Idea.

(btw this is for the fist question)

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