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