Question

BANTU DONG KAK DGN CARA KERJA MAKASIH YAA

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Answer 1

Penjelasan dengan langkah-langkah:

1)

2x - 3y = 12 (×3)

3x + y = 7 (×2)

• 6x - 9y = 36
• 6x + 2y = 14 –

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-11y = 22

y = -2

3x + y = 7

3x + (-2) = 7

3x = 7 - (-2)

3x = 9

x = 3

HP = {x, y} = {3, -2}

2)

3x - 4y = 10 (×2)

5x - 8y = 22 (×1)

• 6x - 8y = 20
• 5x - 8y = 22 –

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x = -2

3x - 4y = 10

3(-2) - 4y = 10

-6 - 4y = 10

-4y = 10 - (-6)

-4y = 16

y = -4

HP = {x, y} = {-2, -4}

3)

-2x + 3y = -9 (×(-2)

4x - 5y = 15 (×1)

• 4x - 6y = 18
• 4x - 5y = 15 –

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-y = 3

y = -3

-2x + 3y = -9

-2x + 3(-3) = -9

-2x + (-9) = -9

-2x = -9 - (-9)

-2x = 0

x = 0

HP = {x, y} = {0, -3}