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3 years ago

Explain what the FIRST STEP is to solve a system of equations like the one below algebraically.

Mathematics

1 answer:

sergij07 [2.7K]3 years ago

7 0

Answer:

transposition method

Step-by-step explanation:

it helps to find that value of y

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3 years ago

10. 2x + 7y = 1<br> 2x - 4y = 12<br> Solve for y

adoni [48]

Answer:

The solution for y = -1.

Step-by-step explanation:

Given:

$2x\ +\ 7y\ =\ 1$ ....(1)

$2x\ -\ 4y\ =\ 12$ ....(2)

So, to solve for y, first we solve for x in equation (2):

$2x-4y=12$

⇒ $2x=12+4y$

Dividing both sides by 2,

⇒ $x=6+2y$

Now, substituting the value of x in equation (1):

$2x+7y=1$

⇒ $2(6+2y)+7y=1$

⇒ $12+4y+7y=1$

⇒ $12+11y=1$

⇒ $11y=1-12$

⇒ $11y=-11$

Dividing both sides by 11,

⇒ $y=-1$

Therefore, the solution for y = -1.

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3 years ago

If sin=3 by 5 and cos =4 by 5 find tan

Afina-wow [57]

Answer:

Step-by-step explanation:

$tan = \frac{sin}{cos }$

=3/5 × 5/4

=15/20

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3 years ago