A line contains the points (1, –6) and (–2, 6). What is the slope of a line that is perpendicular to this line?
A. -1/4
B. 4
C. 1/4
D. –4

Pre-algebra ! : ) use the triangles shown to answer questions 1–3. blue and red congruent triangles name angles 1. name one pair of congruent angles. (1 point) ∠pqr and ∠vst ∠prq and ∠svt ∠rqp and ∠tvs ∠qpr and ∠stv 2. name one pair of congruent sides. (1 point) segments pr and sv segments qr and st segments rp and ts segments pq and vs 3. which method shows that the two triangles are congruent? (1 point) sss sas asa aaa