what does the graph of x=7 look like?
a. vertical line passing the y-axis at 7
b. vertical line passing the x-axis at 7
c. horizontal line passing the y-axis at 7
d. horizontal line passing the x-axis at 7
a. vertical line passing the y-axis at 7
b. vertical line passing the x-axis at 7
c. horizontal line passing the y-axis at 7
d. horizontal line passing the x-axis at 7