Why do we set y=0 to find the x-intercept?

Question

Why do we set y=0 to find the x-intercept?

Answer 1

the x-intercept is where y = 0

Answer 2

because when y = 0 in the equation, u will know what x is.

for example:

y = 3x+2   <-- u cant find out what x and y equal to unless u put in a number,

y = 3(0)+2  <-- when u put in 0 for x, then u can find out what y equal to.

maybe becuase: 0 x anything = 0

Answer 3

x-intercept by definition is where the line on a graph touches the x-axis. Draw a line for yourself.

Make it so that it touches the x-axis just once. What are the coordinates of that point touching the x-axis?

If a line ever crosses the x-axis, it will only do it once. Same goes for y-axis.

Answer 4

That is the definition of the x intercept, when it crosses the x axis.

Answer 5

Because you want to know where the line crosses the x-axis and at that point y is equal to 0.

Ex.  (6,0) means move 6 to the right of zero and put the point there.That would be the x-intercept.