Question 328045
The formula is:
{{{(y - y[1])/(x - x[1]) = m}}}
where( x[1],y[1]) = (2,-1)
plugging in numbers:
{{{(y - (-1))/(x - 2) = -2/3}}}
Multiply both sides by {{{3*(x - 2)}}}
{{{3*(y + 1) = -2*(x - 2)}}}
{{{3y + 3 = -2x + 4}}}
{{{3y = -2x + 1}}}
{{{y = (-2/3)*x + 1/3}}}
Here's the plot:
{{{ graph( 500, 500, -5, 5, -5, 5, (-2/3)*x + 1/3) }}}