How do you make coordinates into an equation?

Question

The coordinates are : (0,3) (3,0). and then theres a line threw them. Can you tell me how pls ?? :)

Answer 1

The equation of a straight like is y = mx + b
where m is the slope and b is the y intercept

slope of the points (0,3) and (3,0) = (y1-y2)/(x1-x2)
(3-0)/(0-3) = -1

sub (0,3) in y = -x + b, b=3

so the eq is y=-x+3

Answer 2

try

x + y = 3
this way when x is 0, y is 3
and when y is 0, x is 3

now change it to standard format
y= 3 - x