what is the missing number?

Answer:
1
Step-by-step explanation:
The equation seems to be y=4x+1
At x=1, y=5
x=2, y=9
x=3, y=13
x=4, y=17
x=0, y=1
Answer:
0 = 1
Step-by-step explanation:
first you should put all of the numbers that we know in the correct order.
1 = 5
2 = 9
3 = 13
4 = 17
now we want to know what 0 is equal to.
first lets try to find a pattern.
1 + 4 = 5
this might seem random but, if you take the 2
5 + 4 = 9
and then...
9 + 4 = 13
13 + 4 = 17.
therefore, you can see that the pattern is to add four for every one that was added on the x side.
5 - 4 = 1.
0 = 1
hope this helps!