Please check if my work is correct

Its my first time using matlab , so please tell me what I'm doing wrong here :

A. x (t)=π[(t -3)/A ]+π[(t -C) /B]

A = 3, B = 4 and C = 4.

A. x (t)=π[(t -3)/3 ]+π[(t -4) /4]

syms X t;
y1 =rectangularPulse(2,5,t);  %pi(t-3\3)
y2 =rectangularPulse(2,6,t);  %pi(t-4\4)
x=y1+y2;
subplot(2,2,2);                   %to make (2*2)figure
ezplot(x,[0 20 0 10]);            %to plots the signal
title('X2(t) = π( ( t-3 ) /3 )+ π( ( t-4) /4 ) ');      %to make  title for figure
xlabel('t'); 
ylabel('X(t)');           
grid on;