From the graph, we can tell that the slope is -2 and the y-intercept is -3. From this we can write the equation y = -2x-3. From here we can change this equation into standard form: 2x + y = -3
You can see that the slope is -2 but peepee obviously cannot.
Peepee can copy your answer but he/she cannot learn from it.
Try leading an asker like this, without just giving them an answer to copy.
For example, you could have asked peepee what the y-intercept and the gradient is. Then waited for a response before you went further.