The electric field in an xy plane produced by a positively charged particle is 7.2(4.0i + 3.0j) N/C at the point (3.0, 3.0) cm and 100i N/C at the point (2.0, 0) cm. What are the
(a) x and
(b) y coordinates of the particle?
(c) What is the charge of the particle?