Which of the following equations have infinitely many solutions?

Choose all answers that apply:

a. 57x+57=-75x-7557x+57=-75x-75

b. - 75x+57=-75x+57-75x+57=-75x+57

c. 75x+57=-75x+5775x+57=-75x+5

d. - 57x+57=-75x+75

b. - 75x+57=-75x+57

Step-by-step explanation:

If an equation after solving does not give the solution but give a true statement then the equation has infinitely many solution,

In option a.

57x+57=-75x-75

57x + 75x = - 75 - 57

132x = - 132

⇒ x = - 1

i. e. it has only one solution,

In option b.

-75x+57=-75x+57

-75x + 75x = 57 - 57

0 = 0 (True)

i. e. it has infinitely many solution.

In option c.

75x+57=-75x+57

75x + 75x = 57 - 57

150x = 0

⇒ x = 0

i. e. it has only one solution,

In option d.

-57x+57=-75x+75

-57x + 75x = 75 - 57

18x = 18

⇒ x = 1

i. e. it has only one solution.