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There are two lines possible passing through any point on coordinate plane which are equally inclined to the coordinate axes. The slopes of the lines are 1 and -1.

let the equation of the required line be y=mx+c

for slope(m) = 1, so the equation becomes y=x+c

as it passes through (-2,5) ⇒ 5 = -2 + c ⇒ c = 5+2 = 7 So one of the equation is y = x+7

for slope(m) = -1, so the equation becomes y=-x+c

as it passes through (-2,5) ⇒ 5 = -(-2) + c ⇒ 5 = 2 + c ⇒ c = 5-2 = 3 So other equation is y = -x+3

when a line is equally inclined to both axes, the angle it will make with x-axis is 45 degree and -45 degrees. so the slopes(tan 45 and tan(-45)) are 1 and -1

you can understand better if you try to visualize the lines on coordinate plane.....or draw them...