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2 years ago

Whoever gets it correct first will get brainlyiest

Mathematics

2 answers:

neonofarm [45]2 years ago

8 0

Its the second one...

oksian1 [2.3K]2 years ago

6 0

The answer would be B

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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

The $99.99 digital camera Mia purchased was on sale for 15% off. What

notka56 [123]

Answer:

84.99

Step-by-step explanation:

5 0

3 years ago

A$250 suit is marked down by 30%. Find the sale price,

Dahasolnce [82]

Answer:

175 is the answer the percentage is 75

4 0

2 years ago

What is the snswer to 3a+2b x 7c

Ad libitum [116K]

I am pretty sure your answer is this because 3+2=5 and 5*7=35 abc

3 0

3 years ago

Read 2 more answers

7 + what can = 91??????

slega [8]

Well you will just subtract 91 - 7 which equals 84.
So 7 + 84 = 91

3 0

3 years ago

Read 2 more answers