I have two equation which both contain one more variable,and how can I get the norm of the two equation?

three variable : x, y, z
equation_1=x-y ;
equation_2=(x+y)-z+1;
how can I write the following inequality in CVX?
|| equation_1, equation_2 || <= equation_2+1

I had a try : norm([equation_1 equation_1])<=equation_2+1;
Is it right ? how can I express the norm?