What is an equation of the line that passes through the points (1,2) and (2,-1) 

You should also try solving it yourself to make sure I did not make any mistake.

Step-by-step explanation:

Equation

First we need to know the slope

So far the equation will look like this

To get the b you insert a point into the equation like this. I picked point (1,2)

We could also check it with the other point and see if we get the same answer.

So the equation is

your answer is a

step-by-step explanation:

4*4*4*4=256

g = (2, 2)

step-by-step explanation:

given the ratio is 1 : 1 then f is the midpoint of eg

let the coordinates of g = (x, y)

using the midpoint formula

(0 + x) = 1 ( multiply both sides by 2 )

0 + x = 2 ⇒ x = 2

similarly

(4 + y) = 3 ( multiply both sides by 2 )

4 + y = 6 ( subtract 4 from both sides )

y = 2

coordinates of g = (2, 2)