Answer:
D.
Step-by-step explanation:
A.
2.3y + 2 + 3.1y = 4.3y + 1.6 + 1.1y + 0.4 combine like terms
(2.3y + 3.1y) + 2 = (4.3y + 1.1y) + (1.6 + 0.4)
5.4y + 2 = 5.4y + 2 subtract 5.4y from both sides
2 = 2 TRUE → infinitely many solutions
B.
32x + 25 - 21x = 10x combine like terms
(32x - 21x) + 25 = 10x
11x + 25 = 10x subtract 11x from both sides
25 = -x change the signs
-25 = x → x = -25 One solution
C.
1/3 + 1/7y = 3/7y subtract 1/7y from both sides
1/3 = 2/7y multiply both sides by 7
7/3 = 2y divide both sides by 2
7/6 = y → y = 7/6 One solution
D. ?
