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3 years ago

3x + 2y = A 5x + y = B Eliminating the variable y from the system of equations results in -7x =

1 answer:

5 0

The answer is A
You would multiply the second equation by -2 to clear the 'y'.
This leaves -10x = 2B and 3x = A
When combining these we get -7x = A - 2B

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PLEASE DON'T IGNORE!

Debora [2.8K]

Answer is b hope this helps

8 0

3 years ago

A salesperson earns $320 per week plus 8% of her weekly sales. The expression representing her earnings is 320 + 0.08x. Which of

Arturiano [62]

Answer:

Here, x represents the weekly sale

As per the statement:

A salesperson earns $320 per week plus 8% of her weekly sales.

"8% of her weekly sales" means $\frac{8}{100}x = 0.08x$

then;

the expression which represents her earning = $320+0.08x$

"At least" means $"\geq"$

then;

the sales necessary for the salesperson to earn at least $1000 in the one week

⇒ $320+0.08x\geq 1000$

Subtract 320 from both sides we have;

$0.08x\geq 680$

Divide both sides by 0.08 we get:

$x\geq 8500$

Therefore, the sales necessary for the salesperson to earn at least $1000 in the one week is: greater than or equal to $8500 i.e $x\geq 8500$

6 0

4 years ago

Doogle drove 30 and one-third miles toward his brother's house in one-third of an hour. About how long will the entire 100-mile

Olenka [21]

Answer:

$1\frac{9}{91}\ hours$

Step-by-step explanation:

we know that

30 and one-third miles is equal to

$30\frac{1}{3}\ mi=\frac{30*3+1}{3}=\frac{91}{3}\ mi$

one-third of an hour is equal to

$\frac{1}{3}\ h$

Applying proportion

$\frac{(1/3)}{(91/3)}\frac{h}{mi}=\frac{x}{100}\frac{h}{mi}\\ \\x=\frac{100}{91}\ h$

Convert to mixed number

$\frac{100}{91}\ h=\frac{91}{91}+\frac{9}{91}=1\frac{9}{91}\ h$

8 0

4 years ago

Read 2 more answers

3^x+3^x =54 what's the value of x ?

AnnyKZ [126]

Answer:

x = 3

Step-by-step explanation:

if you need an explanation let me know

7 0

2 years ago

Read 2 more answers

At a gas station, it takes 14 seconds to pump 2 gallons of gas. if the amount of gasoline pumped varies directly with time, how

EleoNora [17]

Answer:

See below:

Step-by-step explanation:

If we do this, we know that 2 gallons takes 14 seconds. (2:14)

Based on that data, we can know that 1 gallon takes 7 seconds. (1:7)

-> 2/14 = 1/7

Now we can multiply by 12 to get 12 gallons on one side.

What we do on one side has to happen to the other side.

So, 12 gallons * 1 gallons = 12 gallons and 12 gallons * 7 gallons = 84 gallons.

So the final answer is 85 gallons,

7 0

3 years ago

Read 2 more answers