Answer:
You got it wrong because you didn't distribute the 7 to the 3j.
Step-by-step explanation:
The answer should be 21j +70.
1/2³
i had this question before
Answer:

Step-by-step explanation:
Here we are given an equation in x and y and we are required to solve it for y
we have

subtracting 3x from each sides we get


now we divide both sides by 4 we get


Hence A) is our right answer.