Final answer:
The function y=5-3-x has one real solution, which is x=2.
Step-by-step explanation:
The function y=5-3-x can be rewritten as y=-3-x+5. To determine the number of real solutions, we need to find the values of x for which the function equals zero. Setting y=0, we have:
0=-3-x+5
Now, let's solve for x:
x=-3+5
x=2
Therefore, the function y=5-3-x has one real solution, which is x=2.