A linear equation is a straight line that is going at an angle usually, and if you just have a y it will be going straight up,so I would assume that you would always need a x intercept. so yes.
Yes, unless the slope of x is 0.
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No; if the slope is zero and it is above or below y=0 it will not have an x intercept.
The x-intercept is where the line intersects with, or crosses, the x axis. To find it, take the equation, put in 0 for y, and solve for x. The intercept will be (#,0).
At a y-intercept, the graph touches the y-axis, meaning the value of x is 0. So, in any linear equation, simply set x equal to 0 and solve for y. In the slope-intercept form of a linear equation (y = mx + b), the y-intercept value is represented by the variable b.
It is -7.
table of values,x and y-intercept and slope and y-intercept