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Anettt [7]
3 years ago
13

Substitute x=6y-7 4x+y=-3

Mathematics
1 answer:
aliina [53]3 years ago
8 0

Answer:

x = -1

y = 1

Step-by-step explanation:

x = 6y - 7

4x + y = -3

substitute x for 6y - 7 in the second equation

4x + y = - 3

4(6y - 7) + y = -3

open the parenthesis

24y - 28 + y = -3

combine like terms

25y - 28 = -3

add 28 to both sides of the equation

25y - 28 + 28 = -3 + 28

25y = -3 + 28

25y = 25

y = 1

now that you know y is 1, substitute it back into either equation

x = 6y - 7

x = 6 * 1 - 7

x = 6 - 7

x = -1

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mart [117]

Answer:

The median grade would be 89

Step-by-step explanation:

To find the median, first put the numbers all in ascending order.

79, 80, 86, 92, 95, 96

Now isolate the middle term or terms. Since there is an even amount of numbers, we pick the two in the middle. To find the median, we take an average of those terms.

(86 + 92)/2 = 89

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3 years ago
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Which angles are alternate interior angles?
Bingel [31]

Answer:

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3 years ago
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Choose the inverse of y = x2 - 10x.
PilotLPTM [1.2K]

=Y2-10Y

We move all terms to the left:

-(Y2-10Y)=0

We add all the numbers together, and all the variables

-(+Y^2-10Y)=0

We get rid of parentheses

-Y^2+10Y=0

We add all the numbers together, and all the variables

-1Y^2+10Y=0

a = -1; b = 10; c = 0;

Δ = b2-4ac

Δ = 102-4·(-1)·0

Δ = 100

The delta value is higher than zero, so the equation has two solutions

We use following formulas to calculate our solutions:

Y1=−b−Δ√2aY2=−b+Δ√2a

Δ‾‾√=100‾‾‾‾√=10

Y1=−b−Δ√2a=−(10)−102∗−1=−20−2=+10

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3 0
3 years ago
What's the mean, median, and mode of 3, 5, 1, 5, 1, 1, 2, 3, 15.
lara [203]
<h3><em>Answer:</em></h3>

<em>mean = 4</em>

<em>Median = 3</em>

<em>Mode = 1</em>

Step-by-step explanation:

first let’s arrange the numbers from least to highest:

1 , 1 , 1 , 2 , 3 , 3 , 5 , 5 , 15

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

The median is the number that’s comes in the middle of the data set ⇒ median = 3  ( the fifth number in the data set)

1 , 1 , 1 , 2 , <u>3</u>, 3 , 5 , 5 , 15

________________________

The mode is the number that repeats the most ⇒ mode = 1  (repeated 3 times)

____________________________________

\text{the mean} =\frac{1+1+1+2+3+3+5+5+15}{9} = \frac{36}{9}=4

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Only the first one works
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This is a substitution problem...
4 0
4 years ago
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