Straight line graphs. The graph of each of equations is a straight line: If an equation can be rearranged into the form y = mx +c, then its graph will be a straight line.
ax +by= c can be rearranged as (which can be re-written as y = mx+c).
Therefore vertical lines have equations have slope undefined form x =k . Hence graph depend on slope and y-intercept.
st.line graph