Question 176733
You need the formula
{{{(y - y[1]) / (x - x[1]) = (y[2] - y[1]) / (x[2] - x[1])}}}
where the 2 given points are
(x1,y1) and (x2,y2) namely
(0,6) and (2,9)
{{{(y - 6) / (x - 0) = (9 - 6) / (2 - 0)}}}
{{{(y - 6) / (x - 0) = 3/2}}}
multiply both sides by {{{x}}}
{{{y - 6 = (3/2)*x}}}
{{{y = (3/2)*x + 6}}} answer