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3 years ago

2х – у = 73х + y = 3

Mathematics

2 answers:

Leokris [45]3 years ago

4 0

Answer:

x = 2

y = -3

Step-by-step explanation:

Solve by substitution:

2x - y = 7

Move the 2x to the other side: -y = 7 - 2x

Divide by -1: y = -7 + 2x

Take the other equation: 3x + y = 3

Substitute y in: 3x + (-7 + 2x) = 3

Take out the parenthesis: 3x - 7 + 2x = 3

Move -7 to the other side: 3x + 2x = 3 + 7

Simplify: 5x = 10

x = 2

Take the first equation: 2x - y = 7

Substitute x back in: 2(2) - y = 7

Simplify: 4 - y = 7

-y = 3

y = -3

mote1985 [20]3 years ago

3 0

Answer:

1. x = 1/2y + 3.5

2. x = 1 - 1/3y

Step-by-step explanation:

1. add y on both sides then divide 2 by both sides. It will equal x = 1/2y + 3.5

2. subtract y from both sides then divide both sides by 3. You will get x = 1 - 1/3y.

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Solve for x on the domain 0 < x < 12:<br> cos x= -0.814

Morgarella [4.7K]

Answer:

Replace 10.0 with 10.04

Step-by-step explanation:

$\cos(x) = - 0.814$

$\cos {}^{ - 1} ( - 0.814) = x$

$x = 2.52$

Next, use the identity

$\cos(x) = \cos(2\pi - x)$

$\cos(2.52) = \cos(2\pi - 2.52)$

$\cos(2.52) = \cos(6.28 - 2.52)$

$\cos(2.52) = \cos(3.76)$

So another solution is 3.76

After that, use the identity

$\cos(x + 2\pi) = \cos(x)$

So use that for 2.52 and 3.76

$\cos(2.52 + 2\pi) = \cos(8.80)$

8.80 is one solutiin

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2 years ago

What values for x would make the lines parallel?

Svetllana [295]

Answer:

x = 15 degrees

3 angles in triangle are 44, 44 and 92 degrees.

Step-by-step explanation:

When the lines are parallel the internal angles add up to 180 degrees. So:-

8x + 7 + 2x + 23 = 180

10x + 30 = 180

10x = 150

x = 15

In the triangle:-

The angle adjacent to 136 = 180 - 136

= 44 degrees. As 2 sides of the triangle are congruent the other base angle = 44 degrees also.

The third angle = 180 - 2(44) = 92 degrees

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4 years ago

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Ksju [112]

Answer:

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3 years ago

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Step-by-step explanation:

4 0

3 years ago

2х – у = 73х + y = 3​

2х – у = 73х + y = 3