All categories

2 years ago

-2x-2y=-8 -4x-8y=-20

Mathematics

1 answer:

Citrus2011 [14]2 years ago

8 0

Answer:

-2x-2y=-8

-4x-8y=-20

From the 1st eqn

Dividing through by 2

you have

-x-y=-4

Multiply through by -(minus)

x+y=4

x=4-y

Substitute into eqn 2

-4x-8y=-20

-4(4-y)-8y=-20

-16 + 4y - 8y = -20

-4y = -20 +16

-4y = -4

y= 1

Substitute into any of the other eqn's to get x

x= 4-y

x= 4-1

x=3

You might be interested in

A muffin recipe calls for 2/5 tablespoons of vanilla extract for 6 muffins. Arthur is making 18 muffins. How much vanilla extrac

GuDViN [60]

2/5 tablespoons of vanilla extract ... 6 muffins
x tablespoons of vanilla extract = ? ... 18 muffins

If you would like to know how much vanilla extract does he need, you can calculate this using the following steps:

x * 6 = 18 * 2/5
x * 6 = 36/5 /6
x = 36/5 / 6
x = 6/5 = 1 1/5

Result: Arthur will need 1 1/5 tablespoons of vanilla extract for 18 muffins.

7 0

3 years ago

One part of the electromagnetic spectrum that arrives on Earth as solar radiation from the Sun is the visible spectrum. Waveleng

Vlad1618 [11]

White light is the answer.

Also known as visible light consist of a spectrum of different waves. Technically, white is not a color or a wavelength characterized by a white color. Rather, White light is a combination of many colors of the visible spectrum. It shows the full spectrum of electromagnetic spectrum.

8 0

3 years ago

Read 2 more answers

Are these right?!?! Cannot fail

jolli1 [7]

The first one is correct but I don’t know about the second one

4 0

3 years ago

Need to finish in 2 hrs help please

kkurt [141]

The third one is a point with the first equation.

I had to simplify the second equation.

It simplified to,

$y = - \frac{1}{4} x - 2$
The second one with the above is didn't go through so I'd say no solution.

4 0

3 years ago

A transversal intersects two parallel lines. The measures of a pair of alternate interior angles are 5v and 2w. The measures of

Nataly_w [17]

Answer:

The value of v is 6° and the value of w is 15°

Step-by-step explanation:

we know that

When parallel lines are cut by a transversal line, the same-side exterior angles are supplementary and each pair of alternate interior angles is equal in measure

5v=2w -----> equation A

10w+5v=180 ----> equation B

substitute equation A in equation B and solve for w

10w+(2w)=180

12w=180

w=15°

Find the value of v

5v=2w -----> v=2w/5

v=2(15)/5=6°

therefore

The value of v is 6° and the value of w is 15°

3 0

3 years ago