Question

if x=2,y=3 is a solution of a pair of lines 2x-3y+a=0 and 2x+3y-b+2=0,then​

Answer 1

The pair of linear equations are  

2x-3y+a=0  

2x+3y-b+2=0  

2(2)-3(3)+a=0  

4-9+a=0  

-5+a=0  

a=5  

2x+3y-b+2=0  

2(2)+3(3)-b+2=0  

4+9-b+2=0  

13-b+2=0  

15-b=0  

b=15  

a=5,b=15  

15=3*5  

b=3a