How to use the equation y=mx+b

Please fellow users, I remember I had used the expression y=mx+b to plot a straight line graph with y = number and x = number only, values of m and b were not given. I have forgotten the code. can someone help me out of this problem? thank you.

Answer 1

[Star Strider]

x = 0 : 5;
m = 2;
b = 1;
y = m*x + b;

figure(1)
plot(x, y)
grid
axis([0  5    0  12])