Question 499338
Assuming you mean:
{{{170 = (n+2)*(160/(n-3))}}}
{{{170 = ((n+2)*(160)/(n-3))}}}
cross multiply
{{{170*(n-3) = (n+2)*160}}}
{{{170n - 510 = 160n + 320}}}
{{{10n = 830}}}
{{{n = 83}}}
That defines a horizontal line at 83.
.
{{{3n^2 +16n -320 = 0}}}
This is a quadratic equation, so it cannot define a straight line.
.
Perhaps your expressions are different than they appear above.