Question

3x-4y=7,5x+2y=3 by using cramer's rule method
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Answer 1

Answer:

X = 1

Y = -1

Step-by-step explanation:

3x-4y=7

5x+2y=3

a1=3, b1=-4, a2=5,b2=2, d1=7, d2=3

D = |a1 b1 = |3 -4

a2 b2| 5 2|

= (3×2)-(-4×5) =6+20=26

D = 26

Dx = |d1 b1 = |7 -4

d2 b2| 3 2|

=(7×2)-(-4×3)=14+12=26

Dx = 26

Dy = |a1 d1 = |3 7

a2 d2| 5 3|

= (3×3)-(7×5) = 9-35 = -26

Dy = -26

therefore D not equal to zero.

by cramer's rule

X = Dx/D = 26/26 = 1

Y = Dy/D = -26/26 = -1

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