Question 80170
THE ANSWER IS YES. THIS IS A LINEAR EQUATION (EQUATION OF A LINE) 
Y-4X=9, Y=4X+9 IS A QUADRATIC EQUATION FOR A LINE. WHEN GRAPHED LOOKS LIKE THIS:
{{{ graph( 300, 200, -6, 5, -10, 10, y = 4x +9) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 4x +9).