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Scrat [10]
2 years ago
11

Given f(x)=5/2x+7,if f(x)=-13 find x pls show work

Mathematics
2 answers:
Jlenok [28]2 years ago
8 0

Answer:

The value of x = -1/8

Step-by-step explanation:

Given

f\left(x\right)=\frac{5}{2x}+7

f(x)=-13

To determine

The value of x = ?

Using the function

f\left(x\right)=\frac{5}{2x}+7

substituting f(x) = -13 in the function

-13=\frac{5}{2x}+7

Subtract 7 from both sides

-13-7=\frac{5}{2x}+7-7

Simplify

-20=\frac{5}{2x}

Multiply both sides by 2x

-20\cdot \:2x=\frac{5}{2x}\cdot \:2x

Simplify

-40x=5

Divide both sides by -40

\frac{-40x}{-40}=\frac{5}{-40}

x=-\frac{1}{8}

Therefore, the value of x = -1/8

alina1380 [7]2 years ago
4 0

Answer:

x=-25.5

Step-by-step explanation:

5/2(-13) +7=-25.5

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Step-by-step explanation:

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Read 2 more answers
Need some help with these problems!
LekaFEV [45]

Answer:

<em>h=12, w=24, t=8</em>

Step-by-step explanation:

<u>System of Linear Equations </u>

We have 3 unknown variables and 3 conditions between them. They form a set of 3 equations with 3 variables.

We have the following data, being  

w = price of a sweatshirt

t = price of a T-shirt

h = price of a pair of shorts

19.

The first condition states the price of a sweatshirt is twice the price of a pair of shorts. We can write it as

\displaystyle w=2h

The second condition states the price of a T-shirt is $4 less than the price of a pair of shorts. We can write it as

\displaystyle t=h-4

The final condition states Brad purchased 3 sweatshirts, 2 pairs of shorts, and 5 T-shirts for $136, thus

\displaystyle 3w+2h+5t=136

This is the system of equations we need to solve for w,t,h

20.

To solve the system, we replace w in terms of h and t in terms of h. Those relations have been already written, so

\displaystyle 3(2h)+2h+5(h-4)=136

Operating

\displaystyle 6h+2h+5h-20=136

\displaystyle 13h=156

Solving for h

\displaystyle h=12

The other two variables are

\displaystyle w=2h=24

\displaystyle t=12-4=8

4 0
3 years ago
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