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3 years ago

Which of these strategies would eliminate in the system of equations? x-2y=11 5x+3y=-11

Mathematics

2 answers:

fredd [130]3 years ago

6 0

Answer:b

Step-by-step explanation:If you multiply the top equation by -5 then you will have -5 +5, which is 0, therefore you are eliminating the x value

Sergio039 [100]3 years ago

5 0

Answer:

Step-by-step explanation:

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Are these ratios equivalent?

Debora [2.8K]

<h3>Answer: Yes</h3>

========================================================

Explanation

The ratio 8:10 simplifies to 4:5 when you divide both parts by 2.

The ratio 16:20 simplifies to 4:5 when you divide both parts by 4

Therefore the two ratios 8:10 and 16:20 are both equal 4:5, so they are equal to one another.

------------

Put another way,

(8 large)/(10 small) = (16 large)/(20 small)

8/10 = 16/20

8*20 = 10*16 ... cross multiply

160 = 160

We get a true equation, so the first equation is true as well.

This shows the ratios are equivalent.

-------------

Or you could have...

(8 large)/(16 large) = (10 small)/(20 small)

8/16 = 10/20

8*20 = 16*10

160 = 160

We get the same conclusion as before.

3 0

2 years ago

Please help fast‼️‼️

Aleks [24]

Hello from MrBillDoesMath!

Answer: factor = 4

Discussion:

Look at the sequence of numbers

1/64, 1/16, 1/4, 1, 4

It's seems clear that multiplying a term by 4 gives the next term in the sequence.

Thank you,

MrB

4 0

2 years ago

What is the value of x?

Nikolay [14]

Answer:

5 units (you are right!)

Step-by-step explanation:

The triangles ABD and BCD are similar.

Therefore,

$\frac{x}{10}=\frac{10}{4x} \\4x^{2}=100\\x^{2}=25\\x=5$

I hope this helped!

6 0

2 years ago

Solve 3x2 = −12x − 15.<br><br> x = −4 ± 2i<br> x = −4 ± i<br> x = −2 ± 2i<br> x = −2 ± i

diamong [38]

ANSWER

$x = - 2 \pm i$

EXPLANATION

We use the method of completing the squares.

The equation is
$3 {x}^{2} = - 12x - 15$

We rewrite the above equation to obtain;

$3 {x}^{2} + 12x = - 15$

We divide through by 3 to obtain;

${x}^{2} + 4x = - 5$

We add half the coefficient of
$x$

to both sides of the equation to get,

${x}^{2} + 4x + {2}^{2} = - 5 + {2}^{2}$

The right hand side is now a perfect square.

${(x + 2)}^{2} = - 1$

We now take square root of both sides to get;

$x + 2 = \pm \sqrt{ - 1}$

We add -2 to both sides,

$x = - 2 \pm \sqrt{ - 1}$

We simplify to obtain,

$x = - 2 \pm i$

3 0

2 years ago

You buy a piece of candy for 13 cent and have the cashier a dollar how much change will you get back?

Inessa [10]

Answer:

87 cent?......................

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers