Answer:
the second option with y=2x+3
Explanation:
the slope of a line is the ratio y/x (e.g. when x changes by 1 unit, y changes by how many units).
we see here, when x increases by 2 units, y increases by 4 units. so that ratio, the slope, is 4/2 or simply 2.
so the line is y = 2x + c
point A (0,3) tells us for x=0, y = 3, => c = 3
so, the line is y = 2x + 3
also look at the compared ratios of side lengths. you can only relate the equivalent sides of the similar triangles when comparing the ratios.
so, you can only relate DA with EA, for example, and not with e.g. suddenly CE.
the only correct approach is for multiple reasons the second option.