Answer:
r = -4
Step-by-step explanation:
The slope of a line is given by
m= (y2-y1)/(x2-x1)
1/2 = (4-r)/(10 - -6)
1/2 = (4-r) (10+6)
1/2 =( 4-r) /16
Multiply each side by 16
16*1/2 = 4-r
8 = 4-r
Subtract 4 from each side
8-4= 4-r-4
4 = -r
Multiply each side by -1
-4 = r
