I think it’s c (0,2) -2,1 3,2 -40
The only solution is (4, -1/2).
The first one is wrong, because of you substitute X and Y or in this case (12, -5/2) into 3x+2y, you get 31=11, Which is an untrue mathmatical statement.
The second one is right, for the same reason. If you substitute X and Y you will get 11=11. which is a true statement.
The third one is wrong, because you have found a true statement.
The fourth one is wrong because you found an untrue statement.
2x+42=4x
42=2x
21=x
Answer: x=21
Answer: x < 6
<u>Step-by-step explanation:</u>
5x - 9 < 21
<u> + 9</u> <u>+9 </u>
5x < 30
<u>÷5 </u> <u>÷5 </u>
x < 6
Answer:
30°
Step-by-step explanation:
Given
BC=30°
Central abgle is equal to its arc
so <3=30°