Question 356845
{{{y=10x-9}}} is the formula for creating ordered pairs.
You pick an {{{x}}} value, the formula generates a {{{y}}} value which creates an ordered pair ({{{x}}},{{{y}}}).
As an example, when {{{x=0}}}, 
{{{y=10(0)-9}}}
{{{y=0-9}}}
{{{y=-9}}} 
so ({{{0}}},{{{-9}}}) is one ordered pair that lies on this line.