Question 308842
this is a substitution problem, bt I will give you a graph first
{{{graph( 500, -10, 10, -10, 10, -1/3*x+5 ) }}}
*[invoke substitution "1/3*x+5", "x", 0 ]
*[invoke substitution "1/3*x+5", "x", 3 ]
*[invoke substitution "1/3*x+5", "x", -3 ]