1 Answers
y varies directly as w². When y = 8, w = 2, find y when w = 3
Latest posts by Admin (see all)
- Which of the following statements correctly describe(s) cathode rays? - 06/27/2022
- A convex mirror is used as a driving mirror because… - 06/27/2022
- A transistor functions mainly as a… - 06/27/2022
y varies directly as w². When y = 8, w = 2, find y when w = 3
- A. 18
- B. 6
- C. 9
- D. 12
QUICK ANSWER…
A
SOLUTION…
y α w²
y = Kw²
where k = constant.
Therefore,
y/w² = k = 8/2² = 8/4 = 2
Constant = 2, now let’s use the constant to solve for y when w = 3,
Again, y = Kw²
y = 2 × 3² = 2 × 9 = 18
Now for the right answer to the above question:
- Option A is correct.
- Option B is incorrect.
- C is incorrect.
- D is not the correct answer.
KEY-POINTS…
You may please note these/this:
- Write down the proportionality equation,
- Remove the sign of proportionality and introduce a constant,
- Solve for this constant and use it to do subsequent calculations. These are the steps.
If you love our answers, you can login to comment and say hi to us at the comment section…
To raise new related questions, click the ASK A QUESTION BOTTON down this page!
/ culled from 2015 JAMB-UTME mathematics past question 49 /
