How do I solve this?

Answer: J

There’s a few ways to approach this. You just need to figure out which equations are on that graph. I’d start by identifying the equations for the lines. Remember y=mx+b where mx is the slope and b is the y-intercept. Let’s start with the y-intercepts. They’re labeled for you. One is (0,4) and the other is (0,-4). So we have y=mx+4 and y=mx-4. Next, we need to find the slope. You can count the boxes to do that. Find a neat spot where the line crosses a corner (the y-intercept is often a good place to start) and make a sort of triangle using the line as one side. Count the boxes it takes to get up and over to the next intersection at a corner. The line that crosses at (0,4) goes up (rise) one and over (run) one equally. Rise over run, 1/1x. That can be simplified to just x. So one line is y=x+4. The other line goes down two for every one box it goes over. Remember that when it goes down, it’s negative. So that’s -2/1x, or just -2x. The equation is y=-2x-4. Both of those answers are only present in option J.