Question

(1) 3x - 4y = 10 ; 4x + 3y = 5 cramer rule​

Answer 1

Answer:

x=2,y=-1

Step-by-step explanation:

3x-4y= 10

4x+3y= 5

a1=3, b1=-4, a2=4,b2=3, d1=10, d2=5

D = la1 b1 = |3 -4

a2 b2| 4 3|

= (3×3)-(-4×4) =9+16=25

D = 25

Dx = ld1 b1 = |10 -4

d2 b2| 5 3|

=(10×3)-(-4×5)=30+20=50

Dx = 50

Dy = la1 d1 = |3 10

a2 d2| 4 5|

= (3x5)-(10×4) = 15-40 = -25

Dy = -25

therefore D not equal to zero.

by cramer's rule

X = Dx/D = 50/25 = 2

Y = Dy/D = -25/25 = -1

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