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3 years ago

Solve for y. A. 10 B.12 C. 15 D. 18

Mathematics

2 answers:

LiRa [457]3 years ago

8 0

<h2>Answer:</h2>

Option A is the correct answer.

The value of y is:

A. 10

<h2>Step-by-step explanation:</h2>

From the figure we could see that:

3x=90°

so on dividing both side of the equation by 3 we obtain:

x=30°

and we see that ∠DBC=90°

Hence, we get:

2x+3y=90

on putting the value of x in the expression we get:

2×30+3y=90

i.e. 60°+3y=90°

⇒ 3y=90°-60°

⇒ 3y=30°

on dividing both side of the equation by 3 we obtain:

y=10°

Hence, the value of y is:

A. 10

djverab [1.8K]3 years ago

4 0

Y=10°
If we're solving for the ninety degree angle, which I seem to doubt, then if 3x=90 then 2x=60 giving a missing total of 30. 30/3 equals 10

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REY [17]

Answer:

E) None of the above

Step-by-step explanation:

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2 years ago

What is the solution of the system?

spin [16.1K]

The Answer is b: x = 18, y = -20

Proof:

Solve the following system:
{4 x + 3 y = 12 | (equation 1)
{7 x + 5 y = 26 | (equation 2)

Swap equation 1 with equation 2:
{7 x + 5 y = 26 | (equation 1)
{4 x + 3 y = 12 | (equation 2)

Subtract 4/7 × (equation 1) from equation 2:
{7 x + 5 y = 26 | (equation 1)
{0 x+y/7 = (-20)/7 | (equation 2)

Multiply equation 2 by 7:
{7 x + 5 y = 26 | (equation 1)
{0 x+y = -20 | (equation 2)

Subtract 5 × (equation 2) from equation 1:
{7 x+0 y = 126 | (equation 1)
{0 x+y = -20 | (equation 2)

Divide equation 1 by 7:
{x+0 y = 18 | (equation 1)
{0 x+y = -20 | (equation 2)

Collect results:

Answer: {x = 18, y = -20

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3 years ago

....................................e..................................

lina2011 [118]

Answer:

what?

Step-by-step explanation:

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2 years ago

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3 years ago

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Answer:

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Step-by-step explanation:

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2 years ago