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2 years ago

Solve the system of equations using subtraction. 2x - 4y = - 12 2x + y = 13

Mathematics

1 answer:

alisha [4.7K]2 years ago

7 0

First can you change
2x + y = -12
To have y as the subject

Looks like y = ???

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Can anyone solve this for me?? I will give brainliest and 5 stars and thanks

Tcecarenko [31]

Answer:

3 cm

Step-by-step explanation:

When we enlarge or shrink an object, we perform a dilation. A dilation preserves the relationship between sides and the exact angle measure. This means the original and the enlargement are proportional and any missing lengths can be found through a proportion.

A proportion is an equation where two ratios or fractions are equal. The ratios or fractions compare like quantities. For example, we will compare height over length of the original rectangle to an equal ratio of height to length of the enlargement. Since we do not know height of the enlargement, we will use a variable to write:

$\frac{2}{9} =\frac{h}{13.5}$

I can now cross-multiply by multiplying numerator and denominator from each ratio.

$9h=2(23.5)\\19h=27$

I now solve for h by dividing by 9.

$\frac{9h}{9} =\frac{27}{9} \\h= 3$

The new height is 3 cm.

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3 years ago

Unit rate feet per second 180 miles over 2 hours

Tatiana [17]

So that is equal to 180 miles per 2 hours which is 90 miles per hour if each hour has the same m/hr rate.
You can set up a proportion:
let x = number of miles per hour
$\frac{x}{180} = \frac{1}{2}$
cross multiply and you get
2x=180
divide both sides by 2 and you get
x=90
so you get the same answer both ways,
90 miles per hour

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3 years ago

Which of the following expressions represents the LCM of 91 x^2y and 104 xy^3 ?

Allushta [10]

728x^2y^3 hope this helps

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3 years ago

Write ( 5×1)+(1×0.1)+(4×0.01) in base ten numerals

yarga [219]

Th e answer is 5.5
...........

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3 years ago

Maggie’s bank has assigned her a temporary 3-digit PIN to use with her ATM card. Each digit is a number from 1 to 5, inclusive,

Svetradugi [14.3K]

Answer:

Step-by-step explanation:

1/5* 1/4 * 1/3

I think it is the second one

one fifth

one fourth

one third

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3 years ago

Read 2 more answers

Solve the system of equations using subtraction. 2x - 4y = - 12 2x + y = 13​

Solve the system of equations using subtraction. 2x - 4y = - 12 2x + y = 13