Check each equation whose graph is the line that contains the points (4, –7) and (1, 5).
a)y = –4x + 9
b)y = –4x – 23
c)y – 1 = –4(x – 5)
d)y + 7 = –4(x – 4)
e)4x + y = 9

Which of the following is the true for f(x) = 5cos

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.

Two cities a and b are 1400km apart and lie on the same n-s line. the latitude of city a is 23 degrees. what is the latitude of city b. the radius of the earth is approximately 6400km.