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3 years ago

-3x + 7x = -12 what is X?

Mathematics

2 answers:

Oduvanchick [21]3 years ago

8 0

Answer:

-3x+7x= 4x

Step-by-step explanation:

x= -3

frozen [14]3 years ago

8 0

Answer:

x = 3

Step-by-step explanation:

-3x + 7x = -12

-3x + 7x = 4x

4x = 12

4/4 = 1

12/4 = 3

x = 3

Hope this helps .-.

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Ten skeins of yarn will make 4 scarves. how many scarves can be made with 25 skeins of yarn?

ladessa [460]

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3 years ago

What is 5-8|-2n|=-75? And I know it is not n=5 or -5 Please Help!

vichka [17]

Answer:

n = -5

I think the answer is -5, because:

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3 years ago

Need help Math Question Multiple Choice!

erica [24]

Given :

A function f(x) for different range of x.

To Find :

The value of f( -3 ) .

Solution :

We have to find the value of function at x = -3.

Now, in the given figure -3 lies in range x ≤ -2 and definition of function at that range is :

$f(x) = \dfrac{2}{x}$

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Hence, this is the required solution.

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2 years ago

If two points known on the line AB in the coordinate plane is (7,15) and (18,42), calculate the following..

Ksju [112]

Answer:

Slope = 27/11
AB = 29.15 u

Step-by-step explanation:

Given :-

Two points are given to us .
The points are A(7,15) and B(18,42)

To Find :-

The slope of the line .
The length of line AB .

We can find the slope of the line passing through the points $( x_1,y_1)$ and $( x_2,y_2)$ as ,

$\implies m = \dfrac{ y_2-y_1}{x_2-x_{1}}$

Plug in the respective values ,

$\implies m = \dfrac{ 42-15}{18-7} \\\\\implies \boxed{ m = \dfrac{ 27}{11 }}$

Hence the slope of the line is 27/11 .

$\rule{200}2$

Finding the length of AB :-

We can find the distance between them by using the Distance Formula .

$\implies Distance =\sqrt{ (x_2-x_1)^2+(y_2-y_1)^2} \\\\\implies Distance =\sqrt{ (18-7)^2+(42-15)^2 } \\\\\implies Distance =\sqrt{ 11^2 + 27^2 } \\\\\implies Distance =\sqrt{ 121 + 729 } \\\\\implies Distance = \sqrt{ 850} \\\\\implies \boxed{ Distance = 29.15 \ units }$

Hence the length of AB is 29.15 units .

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3 years ago

Find the equation of the line that passes through (-1, 4) and is perpendicular to the

statuscvo [17]

For perpendicular lines, m2 = -1/m1; where m1 is the slope of line 1 and m2 is the slope of line 2.
m1 = (-4 - 2)/(4 - 2) = -6/2 = -3
m2 = -1/-3 = 1/3
Equation of the required line is given by: y - 4 = 1/3 (x - (-1))
y - 4 = 1/3 x + 1/3
y = 1/3 x + 1/3 + 4
y = 1/3 x + 13/3

6 0

3 years ago