Question

6x+7y-11=0;5x+2y-13=0

Answer 1

6x+7y-11=0
6x+7y=11---------1(*5)

5x+2y-13=0
5x+2y=13-----2(6)

subtracting equation 1&2

30x+35y=55

30x+12y=78

23y=-23
y=-1

putting value of y in equation 1

30x-35=55
30X=90
x=3

x=3 y=-1

Answer 2

6x+7y=11
5x+2y=13
Multiplying the eqn 1 by 2 and eqn 2 by 7
we get,
12x+14y=22
35x+14y=91
Subtracting eqn 3 from 4
12x+14y=22 - 35x+14y=91
23x=69
x=69/23
x=3
put x in eqn three
12×3+14y=22
y=-1