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2 years ago

What is the inverse function of dx) = 2x - 4?

Mathematics

2 answers:

miss Akunina [59]2 years ago

8 0

Answer:

y = x/2 + 2

Step-by-step explanation:

y = 2x - 4

swap y and x

x = 2y - 4

x + 4 = 2y

x/2 + 2 = y

n200080 [17]2 years ago

3 0

Answer:

d(x) = 1/2x + 2 or d(x) = (x + 4)/2

Step-by-step explanation:

y = 2x - 4

y + 4 = 2x

(y + 4)/2 = x

y = (x + 4)/2 or y = 1/2x + 2

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2 years ago

Four times a number added to 3 times a larger number is 31. Seven subtracted from the larger number is equal to twice the smalle

aev [14]

Let the smaller number be x.
Let the bigger number be y.

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$\begin{cases} &4x + 3y = 31 \tex{ ----- (1) } \\ &y = 2x + 7 \tex{ ----- (2) } \end{cases}
$

Sub (2) into (1):

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