I will give brainliest to whoever helps, I really need this. pls pls help! thanks!!

Step-by-step explanation:

Problem 1:

The slope of a vertical line is always undefined.The y-intercept of a line occurs when . In this line, is defined already as and therefore there is no y-intercept.The equation of a vertical line is , where is some constant.

Problem 2:

The slope of a horizontal line is always .The y-intercept of a line occurs when . In this line, is declared as 5 for . Therefore, the y-intercept is .The equation of a horizontal line is , where is some constant.

Problem 3:

The slope of a line given two points can be found using . In this case, the slope is .The y-intercept occurs when . Using the equation we found (refer below), plug in to get the y-coordinate of the y-intercept.In slope-intercept form, the equation of a line is written as . Using and any coordinate this line passes through, we find the equation of this line to be . Rearranging this in standard form (), we get .

The first digit is in the middle school 100s place