Question

solve by cramers rule; x+ y=4 and 3x+ 2y=13

Answer 1

x+y=4

3x+2y=13

D=|1 1|

|3 2| =2×1-3×1

= -2

Dx= |4 1|

|13 2| =4×2-13×1

= -5

Dy= |1 4|

|3 13| =1×13-4×3

=3

By Cramer's Rule,

x=Dx/D=5/2

y=Dy/D=3/-2