HNC Maths Vectors

I have the below question that im struggling with how i should be plotting my vector graph can anyone point me in the right direction please.

In a circuit under test a resistor, R, is connected in series with a capacitor, C. An a.c. current, 𝑖, flows through this RC combination, causing a voltage (𝑉𝑅) of 6V to be developed across the resistor, and a voltage (𝑉𝐶) of 8V to be developed across the capacitor.

Assuming that 𝑉𝑅 is in-phase with 𝑖, and 𝑉𝐶 lags 𝑉𝑅 by 90o, draw a vector diagram for this arrangement and then calculate the magnitude of the resultant voltage across the whole RC combination.