4x - 2y = -2 6x + 3y = 27

Mathematics

1 answer:

JulijaS [17]4 years ago

6 0

Answer:

Step-by-step explanation:

4x - 2y = -2 ------------------(I)

6x + 3y = 27 ------------------(II)

Multiply (I) by 3 & multiply (II) by 2

(I)*3 12x - 6y = -6

(II)*2 <u>12x + 6y = 54</u> { Now add & y will be eliminated}

24x = 48

x = 48/24

x = 2

Plugin the value of x in equation (I)

4*2 - 2y = - 2

8 - 2y = -2 {subtract 8 from both side}

-2y = -2 - 8

-2y = -10 {Divide both sides by -2}

y = -10/-2

y = 5

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Step-by-step explanation:

You can look up the formulas for the product identities for sine and cosine, or you can guess and check using a graphing calculator. I did the calculator solution first (see the first attachment), then looked up the identities so I can tell you what they are (see the second attachment).

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