The given graph is same nature that mean x is negative then value of y is positive after the transformation the graph is also same nature that mean the coefficient of graph is positive
so only two possibility of the transformation is:

The transformation graph give higher value for origanal graph so the cofficient is more than one so only one opction is:

For the exact value of cofficient is the orignal function is x=0 then y is 2 but in transformation value of y is 4 so cooficent value is :
