Step-by-step explanation:
(a) Sum is -4
4 + (-8)
4 - 8
-4
(b) Sum is 0
1 + (-1)
1 - 1
0
(c) Difference is 2
10 - 8
2
(d) Difference is -6
10 - 16
-6
<em>infinitely many solutions</em>
- <em>Step-by-step explanation:</em>
<em>Hi there !</em>
<em>3(y - 2) = 3y - 6</em>
<em>3y - 6 = 3y - 6 | + 6</em>
<em>3y = 3y </em>
<em>true ∀ y ∈ R</em>
<em>Good luck !</em>