Question

6. Solve 8X + 5Y - 9 : 3X + 2Y = 4 by cross multiplication method​

Answer 1

Answer:

x =

y =

Step-by-step explanation:

a1 x + b1 y + c1 = 0

a2 x + b2 y + c2 =0

∴ x = $\frac{b2c1 - b1c2}{a1b2 - a2b1}$

∴ y = $\frac{c2a1 - c1a2}{a1b2 - a2b1}$

8x + 5y - 9 = 0

3x + 2y - 4 = 0

∴ x =  $\frac{2(-9) - 5(-4)}{8(2) - 3(5)}$ = $\frac{-18+20}{16-15}$ = $\frac{2}{1}$ = 2

∴ y = $\frac{(-4)8 - (-9)3}{8(2) - 3(5)}$ = $\frac{-32 + 27}{16 - 15}$ = $\frac{-5}{1}$ = -5

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