Answer: A
Explanation: The whole story talks about how The narrator wants "Lucy" to be her sister and "we" means I and another person(s). The theme of the story is that friendship means a lot to children.
y = 7x - 15
Since you're solving for the y-intercept, the value of x is zero.
y = 7(0) - 15
y = 0 - 15
y = -15