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3 years ago

Solve the system by substitution. 2x=y-10 2x+7=2y The solution is ( , ).

Mathematics

1 answer:

Ugo [173]3 years ago

7 0

Answer:

Step-by-step explanation:

2x=y-10

2x+7=2y

====

2x=y-10

x = (y-10)/2

Use this in the 2nd equation:

2x+7=2y

2((y-10)/2)+7=2y

y - 10 + 7 = 2y

-y -3 = 0

-y = 3

y = -3

Use this in either equation:

2x=y-10

2x=(-3)-10

x = -(13/2) or - 6.5

(-6.5, -3)

See attached graph.

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In a circle, two chords that are equidistant from the center of the circle are always ___________? *

tatyana61 [14]

Answer:

option C.

Step-by-step explanation:

According to equidistant chords theorem, two chords of a circle are congruent if and only if they are equidistant from the center of the circle.

Congruent means they are equal in length.

Using equidistant chords theorem, we can fill the blank.

In a circle, two chords that are equidistant from the center of the circle are always equal in length.

Therefore, the correct option is C.

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3 years ago

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guapka [62]

Answer:

Step-by-step explanation:

1/2 * 8 * 15 * x=3360 c^3

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2 years ago

The ratio of boys to girls in a

dybincka [34]

Answer:

48+x/x=7/1

48+x=7x

6x=48

x=8

no. of girls = 8

no.of boys= 48+8

= 56

The answer is 8

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3 years ago

Read 2 more answers

|10-5|>=5 find the absolute value

Romashka [77]

Answer:

= 5

Step-by-step explanation:

1) Subtract the numbers

10 - 5 = 5

2) Apply the absolute rule

IaI = a, a $\geq$ 0

3) Final Answer

= 5

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3 years ago

You have a jar of marbles with 7 red, 12 blue, 6 yellow, and 9 white. What is the probability of selecting a marble that is not

Schach [20]

Answer:

The probability of selecting a marble that is not red, replacing it and then one that is white is 0.2102

Step-by-step explanation:

Number of red marbles = 7

Number of blue marbles = 12

Number of yellow marbles = 6

Number of white marbles = 9

Total marbles = 7+12+6+9=34

Probability of selecting red marble = $\frac{7}{34}$

Probability of selecting no red marble = $1-\frac{7}{34}=\frac{27}{34}$

Now replacing it one marble is drawn again

So, Probability of getting white marble $=\frac{9}{34}$

So,the probability of selecting a marble that is not red, replacing it and then one that is white = $\frac{27}{34} \times \frac{9}{34}=0.2102$

Hence the probability of selecting a marble that is not red, replacing it and then one that is white is 0.2102

3 0

3 years ago