Multiplying a vector by a scalar means to multiply each coordinate of the vector by said scalar.
So, we must multiply both entries by 7:

Answer:
4x-y=-9
Step-by-step explanation:
Answer:
47.581
Step-by-step explanation:
can't explain I just know how to do it
Answer:
56
Step-by-step explanation:
hope it helps
The amount of chlorine needed to treat a swimming pool is directly proportional to the volume of the poolWhat is the constant of proportionality for this relationship