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Anni [7]
2 years ago
13

What is the value of x and y if 21x+7y=42 and -5x+5y=10 are equal

Mathematics
1 answer:
nikdorinn [45]2 years ago
7 0

Answer:

-5x/5 +5y/5=10/5=2

y-x=2

y=x+2

21x+7*(x+2)=42

21x+7x+14=42

28x=42-14

28x=28

x=1

y=1+2

y=3

Step-by-step explanation:

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Answer:

1. Opposite

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Step-by-step explanation:

Since ABCD is a parallelogram, the two pairs of <u>(opposite)</u> sides (AB¯ and CD¯, as well as AD¯ and BC¯) are congruent. Then, since ∠9 and ∠11 are vertical angles, it can be concluded that ∠9≅∠11. Since ABCD is a parallelogram, AB¯∥CD¯. Since ∠2 and ∠5 are alternate interior angles along these parallel lines, the Alternate Interior Angles Theorem allows that ∠2≅∠5. Since two angles of △AEB are congruent to two angles of △CED, the Third Angles Theorem supports that ∠8≅∠3. Therefore, using the <u>(angle-side-angle criterion)</u>, it can be stated that △AEB≅△CED. Then, applying the definition of congruent triangles, it can be stated that AE¯≅CE¯, which makes E the midpoint of AC¯. Use a similar argument to prove that △AED≅△CEB; then it can be concluded that E is also the midpoint of BD¯. Since the midpoint of both line segments is the same point, the segments bisect each other by definition. Match each number (1 and 2) with the word or phrase that correctly fills in the corresponding blank in the proof.

A parallelogram posses the following features:

   1. The opposite sides are parallel.

   2. The opposite sides are congruent.

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7 0
3 years ago
A model for my number has 6 ones blocks, 2 hundreds blocks and 3 tens blocks what number am i?
Hatshy [7]
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5 0
2 years ago
to communication companies offer calling plans with company X it cost $0.30 to connect and then $0.03 for each minute with compa
mario62 [17]

Answer:

$0.30 + $0.03n > $0.02 + $0.02n

Step-by-step explanation:

company x = $0.30 + $0.03n

company y = $0.02 + $0.02n

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4 0
2 years ago
Ted says that 3/10 multiplied by hundred equals 300,000s is he correct
Lostsunrise [7]
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6 0
3 years ago
A college has a financial aid formula that applies to applicants whose family's income is below a certain threshold. The financi
DochEvi [55]

Answer:

1.) 10000, -3, 1000 ; doesn't make sense

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4.) [0,+ ∞ ]

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