Question

Would you use substitution or elimination to solve each of the following systems?

a. {y=2x+1
{y=3x-2

b. {x=3y-1
{3x+5y=4

c. {4x-3y=4
{3x+5y=16

Thanks! : )

Answer 1

Id use a calculator

Answer 2

we use substitution method, when any one of the variable is already isolate,
like in the form y=....
or x=...

Answer 3

so, for 1st one, would you use substitution ?

Answer 4

Yes, for the first one you would use the substitution method =)

Answer 5

correct! :)
what about 2nd ?

Answer 6

Yay! Second one, elimination? Because of the second part of the system not having an isolated variable, correct?

Answer 7

if the variables $x$ and $y$ aern't isolated I would be inclined to use gaussian elimination

Answer 8

any one of the variable is isolated, then you can use substitution
'x' there is isolated, so you would use substitution for 2nd :)

Answer 9

Woops! Okie dokie. Now I know : )

Answer 10

and what about the 3rd ? now its easy, once you understood :)

Answer 11

That would for sure be elimination! None that have an isolated variable.
Wow! Thanks! It's definitely easy once you understand!

Answer 12

correct! good :)

Answer 13

Thanks sooo much again! =)

Answer 14

welcome ^_^