how do find the x-intercept of a line using just 2 points given? plzzzz with an example ok

Question

anonymous · Answer

The equation of a line is: y=mx+c
m and c are unknown, so you have to find them before finding the x-intercept.
To find m(slope), substitute for x and y using the two points and get two equations. Solve them and you'll get m.
Now that you have m, using one of the points, substitute the values of x,y and m in the equation, and you get c.
Finally, rewrite the equation with the values that you've found for m and c, put y=0, and the value of x that you get is your x-intercept.
..
If you could post a sum, I could solve it and show you