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Question

Solve the following system using Cramer’s Rule.

5x+y=13

3x2y=0

A
x=2 and y=3
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B
x=4 and y=5
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C
x=2 and y=3
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D
x=2 and y=3
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Solution

The correct option is D x=2 and y=3
5x+y=13 -------------(1)

3x2y=0-------------(2)

D=5132

=(5)×(2)3×(1)
=103
=13

Dx=13102

=(13)×(2)(0)×(1)
=260
=26

Now,
Dy=51330

=(5)×(0)(3)×(13)
=0+39
=39

Again,

x=(Dx)D and y=(Dy)D

So, x=(26)13=2

and

y=(39)13=3

Hence,

x=2 and y=3

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