You receive a gift card for trading cards from a local store. The function d=20-1.95c represents the remaining dollars d on the
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<u>ANSWER</u>
(C) y
<u>EXPLANATION</u>
We have two equations:
The first one is
The second equation is
Let us make z the subject of this second equation:
We now add equation (1) and (3) to get:
We simplify to get:
Divide throu by 2.
The correct answer is C
Answer:
or
Step-by-step explanation:
We use casework on when and when
.
For the first case, , we add 9 to both sides to get
.
Dividing both sides by 3 gives
For the second case, , we add 9 to both sides to get
.
Dividing both sides by 3 gives
.
Checking both cases, we plug in and
.
For the first case, we have , which satisfies the equation.
For the second case, we have , which also satisfies the equation.
This gives us two solutions to the equation; and
.