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3 years ago

-7(-0.6)+4(-0.5) simplified

Mathematics

1 answer:

avanturin [10]3 years ago

5 0

The answer will be

2.2

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How to solve the system of equation 500y-600x=2800 , 400y-400x=2400 by elimination

tatiyna

Answer:

$x=2$ and $y=8$

Step-by-step explanation:

Given:

Equation 1:

$500y-600x=2800$

Simplifying the above equation by dividing both sides by 100

$\frac{500y-600x}{100}=\frac{2800}{100}$

$\frac{500y}{100}-\frac{600x}{100}=28\\\\5y-6x=28$

Equation 2:

$400y-400x=2400$

Simplifying the above equation by dividing both sides by 400.

$\frac{400y-400x}{400}=\frac{2400}{400}$

$\frac{400y}{400}-\frac{400x}{400}=6\\\\y-x=6$

Now the system of equation is:

(1a) $5y-6x=28$

(2a) $y-x=6$

Solving by elimination

Multiplying equation (2a) with $-5$

$-5(y-x)=-5\times 6$

(2b) $-5y+5x=-30$

Adding equations (1a) and (2b) in order to eliminate $y$

$5y-6x=28$

+ $-5y+5x=-30$

We get $-x=-2$

∴ $x=2$

Plugging $x=2$ in equation (2a).

$y-2=6$

Adding $2$ both sides.

$y-2+2=6+2$

∴ $y=8$

7 0

3 years ago

Macaleh compared the prices of four different brands of coffee.

larisa [96]

Answer:

Brand 1

Step-by-step explanation:

4 Oz of coffee is 1.15

8 Oz of coffee is another 1.15 added, because it is another 4 Oz of coffee

12 Oz is another 1.15 added, it's another 4 Oz of coffee

And so on.

3 0

3 years ago

The rate change of (3,0) and (0,9)

ddd [48]

Answer:

rate of change is -3

A = (9 - 0) / (0 - 3) = 9 / -3 = -3

Step-by-step explanation:

8 0

2 years ago

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A 12-foot ladder is leaning against a building with the base of the ladder 5 feet from the building. How can you find how high o

8090 [49]

Answer:

use the therom of pythagoras

5 0

3 years ago

Si a -5 se le resta -8 Y al total se le agrega 2, ¿Que numero resulta?

raketka [301]

Answer:

- 11

Step-by-step explanation:

- 8 - 5 + 2

- 13 + 2

- 11

3 0

2 years ago

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