Question

I need help solving an=a1+(n-1)d and I'm suppose to solve for d. I need help please :)

Answer 1

transpose a1 to left side.

Answer 2

hmmm, that's just plain simplification, I assume you're not doing sequences evaluations

Answer 3

The first thing to know is that "an" and "a1" are names and do not mean a times n or a times 1

an=a1+(n-1)d

add -a1 to both sides
an-a1 = a1-a1 + (n-1) d

can you simplify the right side ?

Answer 4

you should notice that a1 - a1 is 0 so you can simplify to
an - a1 = (n-1) d

now divide both sides by (n-1)

can you do that ?

Answer 5

yes.

Answer 6

Give it a try.

Answer 7

got the answer thank u!

Answer 8

to divide draw a big line underneath both sides
then write (n-1) under the line on both sides