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for this problem, im not gettin how u arrive at the E field. (ie part a)

the other problem:

7. A line of charge with uniform density 35.0 nC/m lies along the line y = 15.0 cm, between the points with coordinates x = 0 and x = 40.0 cm. Find the electric field it creates at the origin.

i get the value but not the irection of the E field.

can u please help me out