Question

Which equation has only 1 solution? A. c+2=c+2 B. c= -c+2 C. c+2=c-2 D. c-c=2 Please explain.

Answer 1

B. c= -c+2

Explanation:

A. ...................

• c+2=c+2
• c-c= 2-2
• 0=0

It has infinitely many solutions as the equation is correct for any value of c.

B. ...................

• c= -c+2
• c+c= 2
• 2c = 2
• c = 2/2
• c= 1

It has one solution only

C. ...................

• c+2=c-2
• c-c= -2 - 2
• 0 = -4

It has no solution as this equation is incorrect

D. ...................

• c-c=2
• 0 = 2

It has no solution as this equation is incorrect