since there is no slope, there is no x because if you put an x, the slope would be 1. using the point given: ( 4, -5), the first number is the x axis number. the second number is the y axis number. since there is no slope, it is just a horizontal line. the line crosses the y axis at -5 so the answer for a would be y = -5
For b, the slope is zero meaning there is no slope. so like a, there will be no x. this line will also be a horizontal line. this line crosses at -1 on the y axis so the answer will be y = -1
