Hello please answer the entire question and include graphs as well. I went across this question and the answers by different users do not really explain me much, I need this question to be answered more clearly If possible. Thank you so much in advance

4. Consider the following version of the Keynesian cross: (1) Y=C+I+G (2) C=C+c(Y-T) (3) I=I-br Assume that taxes (T) are not fixed but depend on income in the following way: T=T+tY where T >0 and O0, and b >0. (a) How does this tax system change the way consumption responds tochanges in GDP? (b) In the Keynesian cross, how does this tax system alter the government-purchases? (c) Find the IS equation from this Kenesian cross mode. How does this tax system alter the slope of the IS curve