Question

4x-y+5=0 and 3x+2y=7 by cross multiply

Answer 1

4x-y=-5.......(i),,3x+2y=7

In this question,,A1=4,,B1=-1,,C1=-5,,&,,A2=3,,B2=2,,C2=5

Since,,X=B1C2-C1B2/A1B2-B1A2

=(-1)(5)-(-5)(2)/(4)(2)-(-1)(3)

=-5+10/8+3

=5/11 &,,

Y=C1A2-A1C2/A1B2-B1A2

=(-5)(3)-(4)(5)/11

=-15-20/11

=-35/11 ANS.....