M
Mike
Find the coordinates of two points on the line, say (x1,
y1) and (x2, y2). The equation of the line is
(y - y1)/(x - x1) = (y2 - y1)/(x2 - x1) so, for example if
the two points are (3, 2) and (5, 8) the equation of the
line is
(y - 2)/(x - 3) = (8 - 2)/(5 - 3) or
(y - 2)/(x - 3) = 3 or
y - 2 = 3x - 9 or
y = 3x - 7 is the equation of the line.
This gives the formula for finding the y value when the x
value is known. If x = 15 the corresponding y value is
y = 3(15) - 7 = 38.
within the range of the graph and have a function tell me
what the value is on the graph's y axis. Doesnt' seem
like it should be difficult but for the life of me I can't
figure it out.
y1) and (x2, y2). The equation of the line is
(y - y1)/(x - x1) = (y2 - y1)/(x2 - x1) so, for example if
the two points are (3, 2) and (5, 8) the equation of the
line is
(y - 2)/(x - 3) = (8 - 2)/(5 - 3) or
(y - 2)/(x - 3) = 3 or
y - 2 = 3x - 9 or
y = 3x - 7 is the equation of the line.
This gives the formula for finding the y value when the x
value is known. If x = 15 the corresponding y value is
y = 3(15) - 7 = 38.
is be able to enter a number on the x axis that falls
within the range of the graph and have a function tell me
what the value is on the graph's y axis. Doesnt' seem
like it should be difficult but for the life of me I can't
figure it out.