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3 years ago

Given that 8x – 4y = 39Find y when x = 5

Mathematics

2 answers:

sdas [7]3 years ago

8 0

Answer:

y=1/4

Step-by-step explanation:

8(5)-4y=39

40-4y=39

-40. -40

________

-4y=-1

__. __

-4. -4

y=1/4

miv72 [106K]3 years ago

4 0

8(5) - 4y = 39
40 - 4y = 39
-4y = -1, y = 1/4
Solution: y = 1/4

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Marta_Voda [28]

Remember x is x and f(x) is same thing as y.

f(5) = 4

It is same thing as saying, when x = 5, y aka f(x) should be 4. Aka the point (5,4)

Let’s look at D, if x =5 then f(x)=5? No, it should equal 4. So this is wrong. It is also not linear. So NOT D

Lets look at C, if x =5 then
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So, f(x) aka y = 4. Is this correct? Yes when x =5, y indeed should equal 4, but it is not linear. So NOT C

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So, f(x) aka y = 4. Is this correct? Yes when x =5, y indeed should equal 4, AND it is linear SO THE ANSWER IS B

Check A too, it gets y=14 so thats wrong as it is not 4.

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Maurinko [17]

Answer:

C. $\sqrt{89}$ cm

Step-by-step explanation:

First, we can start out by stating that this is a right triangle, since it has a right angle, shown by the marker square in the corner of the triangle. The x part, is called the hypotenuse. When finding the value of the hypotenuse, we use a thing called the Pythagorean Theorem. This theorem is :

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To get c alone, we do the square root of 89.

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3 years ago

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Strike441 [17]

Answer:

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Step-by-step explanation:

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3 years ago

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Given that 8x – 4y = 39Find y when x = 5​

Given that 8x – 4y = 39Find y when x = 5