How can you write the equation for a linear function if you only know two ordered pairs for the function

Step-by-step explanation:

Suppose you have 2 ordered pairs (x1,y1) and (x2,y2).  Get the slope m.

m = (y2 - y1)/(x2 - x1)

In point-slope form, the equation of the line may be obtained using the slope and either of the 2 ordered pairs:

y - y1 = m(x - x1)

and

y - y2 = m(x - x2)

Both of these are equations for the same line that passes through the 2 points defined by the ordered pairs.  You can then easily convert them to the form  

y = mx + b.

They should both give the same value of b.

put them in slope form and then put the slope form into point-slope form ans rhen form the equation (i think?)

Step-by-step explanation: put the two ordered pairs in slope form, then put them in point-slope form. Then form the equations. You have to be sure that the difits in the equation equals the same rhing and doesnt have to flow into more than one equation.

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3