Question

-7x-2y=-13,x-2y=11 solve the equation using substitution method

Answer 1

Answer:

x=3 & y=-4

Step-by-step explanation:

Given:- -7x-2y=-13

x-2y=11

= -(7x+2y)=-13

x-2y=11

= 7x+2y=13_______(i)

x-2y= 11________(ii)

= from eq___(ii)

= x=11+2y___(iii)

= Putting x= 11+2y in eq___(i)

= 7x+2y=13____(i)

= 7(11+2y)+2y=13

=77+14y+2y=13

=77+16y=13

=16y=13-77

=16y=-64

=y=-4

= Putting y=-4 in eq____(iii)

=x=11+2y_____(iii)

=x=11+2(-4)

=x=11-8

=x=3

Hence, x= 3 & y= -4.