yes, it is a linear function in two unknowns, so we are expecting an infinite number of solutions. the solutions are all pairs (x,y) such that y = 3*x + 6. (basically, pick a value for x and y is determined or choose a value for y and x is determined.) the graph is a line in the x-y (cartesian) plane having a slope of 3 and a y-intercept of 6.
