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**[SOLVED] electric field given electric potential**

## Homework Statement

The electric potential in a region of space is V = ( 210 x^{2} - 170 y^{2} ) V, where x and y are in meters.

What is the strength of the electric field at ( 1.00 m, 3.00 m ) ?

## Homework Equations

E = -dV/ds

## The Attempt at a Solution

1. i know i have to find the derivative of the that given equation but i can't figure out where to start...because there are two different variable given...and i don't know in term of which variable i have to find the derivative