Solve using elimination:

5y + 7x + 10 = 0

-14x − 10y = -20

Answers

(10,-16)

(-5, 5)

No solution

Infinitely many solutions

Solve using elimination:

8y = -2x − 16

-x − 4y - 8 = 0

Answers

(3, -20)

(-1, -4)

Infinitely many solutions

No solution

Juanita wants to sign up for a telephone service. The cost of a local phone line is $35 per month plus $0.10 per long-distance call. The cost of a cell phone is $48 per month with unlimited long-distance as long as the minutes do not go over 1,000. How many long distance calls would Juanita need to make on the local phone line to spend as much as she would to have a cell phone?

Answers

65

130

175

350

Solve using elimination:

6x − 2y − 3= 0

4y − 4x = -6

Answers

(0, -3/2)

(2, 9/2)

(7, 4)

(-8,-5)

Solve using elimination:

-5x = -7 + 4y

2y − 12x = 18

Answers

(-1, 3)

(3, 2)

No solution

Infinitely many solutions

Solve using substitution:

-x + 2y = -7

10y − 5x = 21

Answers

Infinitely many solutions

No solution

(-1, -4)

(8, 1/2)