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Jamal is using the distance formula to find the length, d, of the line segment. His work so far is shown. What is Jamal's next step?

Graph shows a line segment and 2 dashed segment plotted on a coordinate plane. Solid segment d has endpoints labeled (x1, y1) and (x2, y2) at (minus 2, 4) and (1, minus 3). A dashed segment extends from (1, minus 3) 3 units left and 7 units up.
Jamal should find the
by
.