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saw5 [17]
3 years ago
9

Please help me its about solving system by substitution

Mathematics
1 answer:
zheka24 [161]3 years ago
5 0

Answer:

heres an example of substitution in a world problem. hope this helps on some other problens

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8x = 2y + 5 3x = y + 7
tamaranim1 [39]
Hello there!

8x = 2y + 5
3x = y + 7
Use the substitution property
We need to solve 3x = y + 7 for y
3x = y + 7
3x - y = 7
-y = 7 - 3x
Divide both sides by -1
-y/-1 = -3x -7/-1
y = 3x - 7
Substitute 3x - 7 for y in 8x = 2y + 5
8x = 2y + 5
8x = 2(3x - 7) + 5
8x = 6x - 14 + 5
8x = 6x - 9
8x - 6x = -9
2x = -9
x= -9/2
To find y, we need to substitute -9/2 for x in y = 3x -7
y = 3x - 7
y = 3(-9/2) - 7
y = -41/2

The correct answer is option A (-9/2; -41/2)

Good luck with your studies!
8 0
3 years ago
(Please help, Multiple Choice) Find the value of X
Nataliya [291]

Answer:

X=19

Step-by-step explanation:

7x-8=6x+11

x=19

3 0
3 years ago
Maria's math test had 25 questions she got 84% correct how many did she get wrong
inysia [295]
\frac{x}{25}=84% \\  \frac{x}{25}=.84 \\ 25( \frac{x}{25})=(.84)(25) \\ x=21
Maria got 21 correct.

Number wrong = Total - Number right
y = 25 - 21
y = 4

Maria got 4 wrong.

Hope this helps!

7 0
3 years ago
Read 2 more answers
Explain how an enlargement or a reduction in the dimensions of a building would cause a change in the scale factor.
swat32

Answer:

It would create an enlarged figure.

Explanation:

A scale factor of  

1

results in a figure of equal dimensions or an isometric figure.

A scale factor of less than  

1

results in a figure of reduced dimensions .

A scale factor of greater than  

1

would result in a figure of enlarged dimensions.

As  

4

3

>

1

, it would create an enlarged figure.

Step-by-step explanation:


5 0
3 years ago
Read 2 more answers
14x² - 21x³ + 49x⁴<br><br>ayudenme porfavor​
Ad libitum [116K]

no se

sólo lo hago esto para poder preguntar

7 0
2 years ago
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