Write, solve and graph inequality. Btw its for both of them

#12 find the value of x. #13 find the value of the variable.

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

What is the missing statement in step 4? ? rts ? ? vtu and ? rtu ? ? vts ? rts ? ? rvs and ? rtu ? ? stv ? vrs ? ? vru and ? usr ? ? usv ? vur ? ? vus and ? uvs ? ? sru