Answer:
1
Step-by-step explanation:
m= (y-y1)/(x-x1)
Points are (-10, -20) and (1, -9)
m= (-20+9)/(-10-1)= (-11)/(-11)= 1
m=1 to replace ? mark
y = -11/9x + 70/9
therefore:
Gradient = -11/9
Y intercept = 70/9
