All categories

3 years ago

System solving! 4x + 5y - 3 = 0 3x - 7y - 13 = 0 Work must be shown, thanks!

1 answer:

8 0

4x + 5y - 3 = 0
4x + 5y = 3

3x - 7y - 13 = 0
3x - 7y = 13

4x + 5y = 3......multiply by 3
3x - 7y = 13....multiply by -4
---------------
12x + 15y = 9 (result of multiplying by 3)
-12x + 28y = - 52 (result of multiplying by 4)
---------------add
43y = -43
y = -43/43
y = -1

3x - 7y = 13
3x - 7(-1) = 13
3x + 7 = 13
3x = 13 - 7
3x = 6
x = 6/3
x = 2

so ur solution is : (2,-1) <==

You might be interested in

Find the missing percent

ololo11 [35]

Answer:

70%?

Step-by-step explanation:

because 7 precent of 10 is 70%

6 0

3 years ago

Read 2 more answers

in 2015 pbi airport saw a decrease in travels from 63,386 in 2014 to 60,129 to the nearest percent what is the percent of decrea

viva [34]

Answer:

5.14% decrease in air travelers.

Step-by-step explanation:

The percent decrease in air travelers is a

$\frac{decrement}{original \:number } \times 100\%$

From the question, the number decreased from, 63,386 to 60,129.

The decrease is :

$\frac{60129 - 63386}{63386} \times 100\%$

We subtract the numerator to get:

$\frac{ - 3257}{63386} \times 100\%$

$= - 0.05138 \times 100\%$

This finally gives:

$- 5.14\%$

Therefore , there was 5.14 percent decrease in air travelers in Palm Beach for 2015

4 0

3 years ago

Check for understanding:

solniwko [45]

Answer:

<em>Daniel does have enough money to make this car payment</em>

Step-by-step explanation:

<u>Addition and Subtraction</u>

Daniel has an initial balance of $460.63 on this checking account.

He must pay $85.23 for groceries.

The new balance is $460.63 - $85.23 = $375.40

He then pays $81.34 for his cell phone bill. The balance is now $375.40 - $81.34 = $294.06.

He receives a shopping refund of $52.13 that adds up to this balance that now is: $294.06 + $52.13 = $346.19.

Daniel has to make his $264 car payment. The balance is $346.19, thus:

Daniel does have enough money to make this car payment

6 0

3 years ago

Si un proyectil asciende verticalmente, y después de 3 segundos alcanza su altura máxima, calcule la velocidad que lleva a la mi

lys-0071 [83]

Answer:

The speed is 20.8 m/s

Step-by-step explanation:

If a projectile ascends vertically, and after 3 seconds it reaches its maximum height, calculate the velocity that it carries to the middle of its downward trajectory

Let the maximum height is h and initial velocity is u.

From first equation of motion

v = u + at

0 = u - g x 3

u = 3 g.....(1)

Use third equation of motion

$v^2 = u^2 - 2 gh \\\\0 = 9 g^2 - 2 gh \\\\h = 4.5 g$

Let the speed at half the height is v'.

$v^2 = u^2 + 2 gh \\\\v'^2 = 0 + 2 g\times 2.25 g\\\\v'^2 = 4.5\times 9.8\times9.8\\\\v' = 20.8 m/s$

8 0

3 years ago

3.5x + y - 10.2x + 2.3y =

Goshia [24]

Answer:

-6.7x + 3.3y

Step-by-step explanation:

Step 1: Write out expression

3.5x + y - 10.2x + 2.3y

Step 2: Combine like terms (x)

-6.7x + y + 2.3y

Step 3: Combine like terms(y)

-6.7x + 3.3y

3 0

4 years ago

Read 2 more answers