Calculating Current in Two Parallel Resistances

Like I have already stated in one of the previous posts, voltage is the same in parallel resistor connection.
Voltage for resistor 1 = Voltage for resistor 2

That is to say (Voltage supplied), V = (I1R1 = I2R2).
Not forgetting that V = IR
Also Is = I1 + I2. (Is is the current supplied)
I-I1 = I1-I1+I2
I2 = I-I1
Substitute I2 in the equation V = (I1R1 = I2R2)
I1R1 = R2(I-I1)
I1R1 = IR2 - I1R2
I1R1 + I1R2 = IR2
I1(R1+R2) = I*R2
I1 = I*R2 / R1+R2
Similarly
I2 = I*R1 / R1+R2