Math 116
posted by Keisha .
1.Write an equation of the line containing the given points and parallel to the given line (3,8); x+5y=3
2. Write an equation of the line containing the given points and parallel to the given line (3,6); 5x=9y+2
3. Write an equation of the line containing the given points and perpendicular to the given line (4,5); 9x+y=7
4. Write an equation of the line containing the given points and perpendicular to the given line (5,2); 9x+2y=7
5. Media Services charges $30 for a phone and $20/month for its economy plan. Find a model that determines the total cost, C(t), of operating a Media Services phone for t months. C(t)=?

1. (3,8), x + 5y = 3.
m = m2 = A/B = 1/5.
y = mx + b,
y = (1/5)3 + b = 8,
b = 8 3/5.
y = (1/5)x + 8 3/5.
2. Same procedure as #1.
3. (4,5), 9x + y = 7.
m = 9/1 = 9.
m2 = 1/9.
y = (1/9)4 + b = 5,
b = 5  4/9 = 4 5/9.
y = (1/9)x + 4 5/9.
4. Same procedure as #3.
5. C(t) = 20t + 30.