Is my coding assignment correct?

Hi all, I've been working on this assignment for a few hours & searching for the right way to code this but I'm still unsure if it is correct. Can someone please let me know if this is correct. I'm mostly unsure about 4 and 5.

Instructions.

1. [1 pt] Generate this set of linear data:

x0 = 1:1:20;

y0 = -5 +2*x0;

2a. [1 pt] Add measurement to the y values:

y1 = y0 + 1.0*randn(size(y0));

2b. (1 pt) Open a new figure and plot the noisy data with black circle markers:

3. [3 pts] Use polyfit( ) to fit a line to the noisy data.

4. [3 pts] Use polyval( ) to compute the y-values of the fitted line, using x0 for the x-values.

5. [1 pt] Plot the fitted line on the same figure as the noisy data. Use a red dashed line: 'r--'

My code.

x0 = 1:1:20;

y0 = -5 +2*x0;

y1 = y0 + 1.0*randn(size(y0));

figure;

plot(x0,y1,'o','MarkerFaceColor','k')

grid on;

hold on;

coeffs2 = polyfit(x0,y1,1);

besty = coeffs2(1)*x0 + coeffs2(2);

plot(x0,y1,'o',x0,besty)

x2 = linspace(0,2);

y2 = polyval(coeffs2,x2)

plot(x2,y2,'r--')

[Dyuman Joshi]

It looks good, but there's a bit of redundant code

%Task 1
x0 = 1:1:20;
y0 = -5 +2*x0;
%Task 2a
y1 = y0 + 1.0*randn(size(y0));
%Task 2b
figure;
plot(x0,y1,'k.','MarkerSize',10)
grid on; 
hold on;
%Task 3
coeffs2 = polyfit(x0,y1,1);
%Task 4
y2 = polyval(coeffs2,x0);
%Task 5
plot(x0,y2,'r--')