R= V/I
R is resistance
V is voltage
I is current
We can multiply by I both side
I*R = (V/I)*I
I will cancel out from right side
so IR = V
we can write it
V= IR
V= RI + 0
This equation is same as Y = MX +C
here Y is V
M is R which shows slope in a graph and it is constant
C is Y intercept but it will be zero because if potential difference is zero then current will also be zero