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3 years ago

What is the value of x in the equation 8x-2y=48, when y=4?.

Mathematics

2 answers:

gavmur [86]3 years ago

6 0

$8x-2*4=48 \Rightarrow 8x-8=48 \Rightarrow 8x=56 \Rightarrow x=7$

maxonik [38]3 years ago

5 0

8x-2y=48
y=4
8x-2×4=48
8x=48+8
8x=56
x=7

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Solve the system of equations using substitution and Elimination

juin [17]

<h2>Greetings!</h2>

Answer:

y = $\frac{-18}{7}$ and x = $\frac{50}{7}$

Step-by-step explanation:

To solve simultaneous equations, you need to have the number in front of both x's or y's the same. (signs doesn't matter)

To get -x to -10x we simply need to multiply the first equation by 10:

-x * 10 = -10x

-9y * 10 = -90y

16 * 10 = 160

-10x - 90y = 160

Now we can add the two equations:

-10x + 10x = 0

-90y + 20y = -70y

160 + 20 = 180

-70y = 180

70y = -180

7y = -18

y = $\frac{-18}{7}$

Now plug $\frac{-18}{7}$ into the second equation:

10x + 20( $\frac{-18}{7}$ ) = 20

10x - $\frac{360}{7}$ = 20

Move the $\frac{360}{7}$ over to the other side, making it a positive:

10x = 20 + $\frac{360}{7}$

10x = $\frac{500}{7}$

Divide both sides by 10:

x = $\frac{50}{7}$

So y = $\frac{-18}{7}$ and x = $\frac{50}{7}$

<h2>Hope this helps!</h2>

5 0

2 years ago

A pair of designer sneakers was purchased for $120.

Brums [2.3K]

Answer:the price now is $128

Step-by-step explanation:

you can get this by dividing the cost by the percentage it has risen by. For example: 120 / 15 = 8 and then you add 8 to the initial price

6 0

2 years ago

Read 2 more answers

One number is 8 more than another. If the sum of the smaller number and twice the larger number is 46, find the two numbers.Let

valkas [14]

Answer:

x = 18 y = 10

Step-by-step explanation:

let the first number be x

let the second number be y

x = y + 8..... equation 1

2x + y = 46.... equation 2

x is the larger number

y is the smaller number.

Rearrange the equation and add equation 1 to equation 2.

x - y = 8

+ 2x + y = 46

-------------------

3x + 0 = 54

3x = 54

divide both sides by 3

x = 54/3

x = 18

Substitute x = 18 into equation 1

x = y + 8

18 = y + 8

collect like terms

y = 18-8

y = 10

3 0

2 years ago

Graph this function:<br> y = 2x

77julia77 [94]

Graph is attached below.

Step-by-step explanation:

We have to graph function y = 2x,

From equation, we can see a linear relationship between the values of x and y. This equation shows that the value of y is double than the value of x.

For example,

y = 2(0)

y = 0

So, point would be (0,0)

y = 2(1)

y = 2

So, point would be (1,2)

y = 2(3)

y = 6

So, point would be (3,6)

y = 2(-1)

y = -2

So, point would be (-1,-2)

y = 2(-3)

y = -6

So, point would be (-3,-6)

By matching these points, a linear graph can easily be drawn. I have also attached the graph pic below.

Keywords: function, graph

Learn more at:

brainly.com/question/1600331

brainly.com/question/2334270

#LearnwithBrainly

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2 years ago

What is the vertex f(x) = 10x^2 + 20x -11

aniked [119]

Answer:

You and me together

Step-by-step explanation:

;) Think about it 10x meaning looks 10 20x is me obvs and 11 negative. Sorry it's not meant to be:(

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3 years ago