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4 years ago

Which equation repesents a direct proportion?

Mathematics

2 answers:

djyliett [7]4 years ago

8 0

Answer c because it is timing it by two

Tcecarenko [31]4 years ago

5 0

Answer:

Step-by-step explanation:

In mathematics, a direct proportion is defined as

$y=kx$

Where $k$ is a constant of proportionality.

One way to describe this proportionality is to say that "if we increase one variable, the other one will also increase", "if we decrease one variable, the other one will also decrease".

But, in this case, the right answer is the one that has the same form as the defintion $y=kx$ .

Therefore, the right anwer is C.

$2y=10x$

$y=5x$

Where the constant is 5.

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Two worded maths questions. Even if you know one answer it would help! Please also give working out if possible.

Fiesta28 [93]

Answer:

675 litres
80 mL

Step-by-step explanation:

1. The total amount of oil in the two tanks at the start is ...

total oil = n + (n +150) + 0 = 2n+150 . . . . litres

The amount of oil in tank C at the end is 1/3 this amount, or

oil in tank C = (total oil)/3 = (2n+150)/3 . . . . litres

The amount pumped into tank C was 500 litres, so we have ...

(2n +150)/3 = 500

2n +150 = 1500 . . . . . . multiply by 3

2n = 1350 . . . . . . . . . . . subtract 150

1350/2 = n = 675 . . . . . divide by the coefficient of n

___

2. Let x represent the amount remaining in container A. Then 4x is the amount in tank B. Before the transfer, the amount in each container was the same, so ...

x +120 = 4x -120 . . . . . A had 120 more than remains; B had 120 less

240 = 3x . . . . . . . . add 120-x

240/3 = x = 80 . . . divide by the coefficient of x

The amount of liquid left in container A is 80 mL.

3 0

4 years ago

Solve x + 5 = 7.

Rudiy27

Answer: C

|x+5| = 7 (Spilt into 2 problems)

X+5=7
X+5=-7

Solve for x on both

x=2 and x=-12

5 0

2 years ago

If someone could help me that would be amazing! Thank you!

Anastasy [175]

I’d say 135 or B! I hope this helps!

4 0

3 years ago

Given this table of values, what is the value of f(-4.5) ? help pelase !!

True [87]

Answer:

12.6

Step-by-step explanation:

f(-4.5) means "what is the y-value when x equals -4.5?"

We see that when x = -4.5, our y or f(x) value is 12.6

7 0

3 years ago

Determine the slope-intercept form of the equation of the line parallel to y = x + 11 that passes through the point (–6, 2). y =

Vika [28.1K]

Answer:

$y = x+12$

Step-by-step explanation:

Parallel => This means it has the same slope as this one.

Slope = m = 1

Now,

Point = (x,y) = (-6,2)

So, x = -6, y = 2

Putting this in slope intercept form to get b

$y = mx+b$

=> 2 = (1)(-6) + b

=> b = 2+6

=> b = 8

Now putting m and b in the slope-intercept form to get the required equation:

=> $y = mx+b$

=> $y = x+12$

6 0

3 years ago