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I am afraid you have to do some programming For example:

def y2_axis(x,y1,y2,y3,d=50):
    G = line([(x,0),(x,y2-y1)],color='red')
    G += text(str(y2), (x*1.03,y1),color='red',horizontal_alignment='left')
    G += text(str(y3), (x*1.03,y1+y3-y2),color='red',horizontal_alignment='left')
    yd = d
    while yd < y3-y2:
        G += line([(x,y1+yd),(x*1.01,y1+yd)],color='red')
        G += text(str(y2+yd), (x*1.03,y1+yd),color='red',horizontal_alignment='left')
        yd += d
    return G

phi = var('phi')
a=2
q1=a*phi^2+1
q2=a*phi^2 #+2000
t1=q1.plot(aspect_ratio=1,xmin=0,xmax=10,thickness=2)
t2=q2.plot(aspect_ratio=1,xmin=0,xmax=10,thickness=2,linestyle='--',color='red')
z=t1+t2
z += y2_axis(10,0,2000,2300)
z.show(xmin=0,xmax=10,ymin=0,ymax=300,aspect_ratio=0.02)