<span>x + 3y = –9
3x – 3y = 21
-------------------add
4x = 12
x = 3
substitute x = 3 into </span>x + 3y = –9
3 + 3y = –9
3y = -12
y = -4
Answer
(3, -4) is the solution of the system.
Answer: Y= 67
Step-by-step explanation:
The equation says;
Y= 15x + 7
When x=4
We have Y= 15(4)+7 by substituting the value of x for the equation. So, we have
Y=60+7
Y= 67
Answer: 144 minutes
Step-by-step explanation:
Based on the information that has been given in the question, the minutes that the slower pipe alone can use in filling the tank can be denoted by y minutes.
Therefore, the faster pipe will fill it in 1/3 × x = x/3 minutes.
Therefore,
1/x + 3/x = 1/36
4/x = 1/36
x = 36 × 4
x = 144
The number of minutes taken by the slower pipe will be 144 minutes.
