trivial problem with trying to graph 2 functions

edit

I'm very new to SageMath. I want to plot two functions on 1 graph. Here is the code

@interact
def draw1st_2nd_Order( k1=slider(0.01, 10, 0.1, 5, label = "k1 (s^-1)"), k2=slider(0.01, 10, 0.1, 5, label = "k2 (M^-1s^-1)" ) ):
    f(t) = 10*e^(-k1*t)
    g(t) = 10/(1+(10*k2*t))
    P1 = plot( f(t), 0, 10, ymin=0, ymax=10, color=’blue’, gridlines='minor') 
    P2 = plot( g(t), 0, 10, ymin=0, ymax=10, color='red')
    P=P1+P2
    P.show()
    print
    print "The x-axis is time in sec."
    print "The y-axis is [A] in mM."    
    return

This is the error I get:

File "<ipython-input-1-8e804a2c9a22>", line 5
    P1 = plot( f(t), Integer(0), Integer(10), ymin=Integer(0), ymax=Integer(10), color=’blue’, gridlines='minor')
                                                                                       ^
SyntaxError: invalid syntax

I'm trying to convert lots of Mathematica files to SageMath for an online biochem text. Once I get this example worked out, I can easily convert the rest. Any help would be greatly appreciated Henry J