12x + 3 = 4x + 6

By Posted on

x = ?

15y + 15 = 5y – 5
y = ?

14z + 16 = 4z – 4
z = ?

{x , y , z} ↪ { , , ,}​

12x + 3 = 4x + 6

12x + 3 = 4x + 6

12x – 4x = 6 + 3

8x = 9

x = 8/9

15y + 15 = 5y – 5

15y – 5y = 15 + 5

10y = 20

y = 20 / 10

y = 2

14z + 16 = 4z – 4

14z – 4z = 16 + 4

10z = 20

z = 20 / 10

z = 2

" PLSV "

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1.

12x + 3 = 4x + 6

12x – 4x = 6 – 3

8x = 3

huge boxed{ sf x = frac{3}{8}}

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2.

15y + 15 = 5y – 5

15y – 5y = – 5 – 15

10y = – 20

y = – 20 ÷ 10

huge boxed{ sf y = - 2}

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3.

14z + 16 = 4z – 4

14z – 4z = – 4 – 16

10z = – 20

huge boxed{ sf z = - 2}

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huge boxed{ sf (x,y,z) = ( frac{3}{8} , - 2, - 2)}