Algebra
posted by Rick on .
Find a linear equation whose graph is the straight line with the given property. HINT [See Example 2.]
Through (2, −3) and (1, 1)
Which formula do I use?
y2y1/x2x1 or yy1=m(xx1)[<if i use this how do i plug in the numbers?]
Thank you.

Use both formulas.
m = (y2  y1)/(x2  x1)
= [1  (3)]/(1  2)
= (1 + 3)/(1  2)
= 4/1 or 1/4
Substitute the first ordered pair into the second formula:
y  (3) = 1/4(x  2)
y + 3 = 1/4x + 2/4
y = 1/4x + 2/4  3
y = 1/4x  10/4
This equation is in the form: y = mx+b
I hope this helps.