Question

write any linear equation in two variables which is parallel to x-axis

Answer 1

ax+by+c =0
is standard eq. of two variables
since parallel to x axis
so y component will be zero
ax+c=0
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Answer 2

X+Y =3 
PUT 0 
SO [0,3] IS THE PLOT 
WHE WE MARK IT IN GRAPH 
THE EQUATION IS PARALLEL TO  X AIS