Answer:
2
Explanation:
y2-y1 4-2 2
-------- = --------- = ---------- = 2
x2-x1 2-1 1
the x and y are being multiplied by 2 e.g. 1 × 2 is 2 and 2 × 2 is 4 so the constant is 2
5.2m questions
6.7m answers