All categories

3 years ago

Find the solution of this system of equations x-8y=21 and 3x--8y=15

1 answer:

7 0

If you would like to find the solution of the system of equations, you can do this using the following steps:

x - 8y = 21 /*(-3)
3x - 8y = 15
______________
-3x + 24y = -63
<span>3x - 8y = 15
</span>______________
-3x + 24y + 3x - 8y = -63 + 15
16y = -48 /16
y = -48/16
y = -3

<span>x - 8y = 21
</span>x = 21 + 8y
x = 21 + 8 * (-3)
x = 21 - 24
x = -3

(x, y) = (-3, -3)

The correct result would be (-3, -3).

You might be interested in

Can someone help me!!!!!!

andriy [413]

Answer:

The value of x is 4, 3rd point.

Step-by-step explanation:

Move all the variables to one side & move unknown value to the other side :

4x - 3 = 2x + 5

4x - 2x = 5 + 3

2x = 8

Then solve it :

2x = 8

x = 8/2

x= 4

5 0

3 years ago

Read 2 more answers

10. What is the perimeter of the triangle with sides 15 in, 20 in, and 25 in?

Gnom [1K]

Answer:

P = 60 inches

Step-by-step explanation:

Perimeter is the distance around the outside of a shape. So, to find perimeter, add up all the sides.

The side lengths were given, add them:

15 + 20 + 25

= 60

The perimeter is 60 inches.

6 0

2 years ago

A rectangular container that has a length of 30 cm, a width of 20 cm, and a height of 24 cm is filled with water to a depth of 1

BaLLatris [955]

Answer:

$5400cm^{3}$ more water could be added to the container before the container overflows

Step-by-step explanation:

The volume of the rectangular container is got by multiplying its given dimensions: Length X breadth X height

This will be 30 X 20 X 24 = $14400 cm^{3}$

To find the volume of water inside the rectangular container, we will use the new height for our computation of volumes, keeping the length and breadth of the cylinder the same.

This will be $30 \times 20 \times 15 =9000 cm^{3}$

The volume of water needed to be added until the container overflows will be got by subtracting the volume of water present in the container from the total volume of the container

$14400 - 9000 =5400cm^{3}$

Note 1 $cm^{3}= 1 ml$

4 0

3 years ago

If w and are numbers, which of the following expressions will always be the distance between w and Q

aev [14]

<h3>Answer: Choice A. |w - q|</h3>

Let's say for example that w = 10 and q = 7. This means the distance between these values is w-q = 10-7 = 3. This is the distance between w and q.

Now let's make q larger. If w = 12 and q = 20, then w-q = 12-20 = -8 assuming we subtract in the same order. We use absolute value bars to ensure the result is positive. So instead we say

|w - q| = |12 - 20| = | -8 | = 8

Distance is never negative.

3 0

4 years ago

Help, please i need this asap

MAVERICK [17]

Answer: He would need to ride on average 7.9 miles each day

Step-by-step explanation:

let x = the average number of miles he would have to ride each day to reach his goal.

$39.6=4x+8\\39.6-8=4x+8-8\\31.6=4x\\\large\boxed{x=7.9}$

4 0

2 years ago