Erin's Responses in WyzAnt Answers

A vertical line passing through the point (4, -3) means that for any value of y, x is always going to be equal to 4; the formula may be generally written as x = a where a is the x-intercept.. An x-intercept is the value of x when y = 0. As we already stated, for any value of y, x = 4. Therefore, this vertical line will pass through the point (4,0). You can write the equation as x = 4. Graphing this equation in a graphing calculator requires you to "trick" the graphing calculator because in the "graph" menu you only have the option of writing in equations in the form y =, which you can't do for this problem. If out try to type in y1=x-4, you won't get a vertical line, you will get a line with as slope of 1 that passes through the point (0,-4). What you need to do is type the equation in as follows y1= (really big number)(x-4) = 100000(x-4), thereby giving you a "workable" vertical line.

If you look at the periodic table, Al's atomic number is 13, so it must have 13 protons(+1) and, resultantly, 13 electrons (-1) to balance out the charge.