Final answer:
The y-component of vector v is -3.
Step-by-step explanation:
To find the y-component of vector v, we can use the equation 5v = ⟨–15, 5y⟩ and compare it to the given component form of vector v, which is v = ⟨– 3, y⟩. By comparing the y-components of both equations, we can determine the value of y:
-15 = -3 * 5
From this, we can deduce that y = -3.