Question

I can’t figure out what it is asking. How do you find where each line crosses the y-axis?..

Answer 1

They want you to find the y intercept. This is the point where the curve or line crosses the y axis. To find the y intercept, plug in x = 0

y = 3x+4
y = 3*x + 4
y = 3*0 + 4 ... notice x has been replaced with 0
y = 0 + 4
y = 4

So when x = 0, the value of y is y = 4. This means the y intercept is located at the point (0,4). This is all for problem 1. Problem 2 is handled much the same way.

Answer 2

The y axis is the one that goes up and down so where ever the line cross the up and down line is where it crosses the y axis