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What is the value of y when x = 6? -3x + 9y = 18
2 answers:
Answer:
y=4
Step-by-step explanation:
We are given the expression:
We want to find when
equals 6. Therefore, we can plug 6 in for x.
Now, let's begin solving for y. First, multiply -3 and 6.
Next, add 18 to both sides of the equation. We add because 18 is negative and addition will cancel out the -18 on the left.
Finally, divide both sides by 9. We divide because y is being multiplied by 9, and division is the inverse of multiplication.
When x=6 in the equation, y is equal to 4.
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Answer:
15 seconds.
Step-by-step explanation:
∵ The distance covered by plane in first second = 100 ft,
Also, in each succeeding second it climbs 100 feet more than it climbed during the previous second,
So, distance covered in second second = 200,
In third second = 300,
In fourth second = 400,
............, so on....
Thus, the total distance covered by plane in n seconds = 100 + 200 + 300 +400......... upto n seconds
( Sum of AP )
Suppose the distance covered in n seconds is 12,000 feet,
∵ n can not be negative,
Hence, after 15 seconds the plane will reach an altitude of 12,000 feet above its takeoff height.