Answer:
A, C, D
Step-by-step explanation:
The sum of two irrational numbers may be rational:
√2 + (-√2) = 0
so that set is not closed under addition.
___
For any of the other sets, addition of two members of the set always results in another (not necessarily different) member of the set.
6x+15y=-45
<span>6x+5y=-35
subtract second equation from the first
</span>6x+15y=-45
<span>6x+5y=-35
</span><u>- - +
</u> 10y = -10
⇒ y = (-10/10) = 1
put value of y in one of the equation,
6x+5y = -35
⇒ 6x + 5(-1) = -35
⇒ 6x - 5 =-35
⇒ 6x = -35 + 5 = 30
⇒ x = 30/6
⇒ x = 5
So x=5 and y=-1.
Answer:
15.48 doller tip
Step-by-step explanation:
Okey.but where is your question
You would save $2.99
Work: 14.99 / 5 = 2.99