How does the IS curve change when we change the behavior of consumers or investors? Suppose $$ C(Y,T) = a + b \times (Y-T) $$ $$PI(r) = d - h \times r $$ and taking T and G as exogenous The equation for the IS curve is $$ Y = \frac{1}{1-b} \times (a - bT + d - hr + G ) $$
Below you can pick high, medium or low values for each parameter. The initial curve (in black) has medium values for each. When you have made your selection, hit the plot button!