Mathematics
12.04.2021 13:16
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4x - 2y = -2 6x + 3y = 27

4x - 2y = -2 6x + 3y = 27
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avahrider1
avahrider1
4,9(20 marks)

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          12x + 6y = 54  { 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

 

mags1467
mags1467
5,0(61 marks)
You use the discriminant (b²-sqr(4ac))/2a and if sqr(4ac) inferior to 0 then use i = sqr(-1)

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