Finding equation of lines from given information

Question 1

what is the formal to find the gradient when given two co-ordinates?

Answer 1

y2-y1/ x2- x2

Question 2

how do you know which one is x1 and x2

Answer 2

the largest x value is x2

Question 3

how to find the m and c and form a eqaution when two co ordinates are given

Answer 3

first find the m by using the formula y2-y1/ x2- x2

chose one of the two co-ordinates and subtituse the vales… y (will be the y co-ordinate), m (will the graident you just found), x you multiply the m by the x value) and then + c.

then solve