Answer: (6, -19)
Explanation:
y = 4x + b
substitute ( 10, -3) to find b
b = -43
equation of line is:
y = 4x -43
substitute (6, r)
y = 4(6) - 43
solve for y to find r
y = -19
this means that the missing coordinate r is -19
the full coordinate is (6, -19)