Question

Which is most likely the first step in solving a system of nonlinear equations by substitution?

A. Substituting a number for one of the variables
B. Substituting one equation into the other equation
C. Isolating a variable in one of the equations
D. Taking the square root of both sides of one of the equations

Answer 1

what makes sense to you?

Answer 2

I feel like this is a bad question because it depends sometimes... I feel like it could be multiple depending how they are written

Answer 3

B i think

Answer 4

You can't substitute of a variable isn't isolated

Answer 5

That is why it can be b or c i dont know

Answer 6

B

Answer 7

actually it could be C also

Answer 8

@pgpilot326 what do you think

Answer 9

sometimes you can't isolate a variable...

Answer 10

I'm totally confused. Maybe C because if it involves an equation where you need to isolate the variable first... then it would be C.

Answer 11

in order to substitute you need y= or x= or you can't...

Answer 12

but, C does make the most sense in most cases

Answer 13

ur right. so it would be c then...

Answer 14

you can isolate x^2 or something like that and sub in... i've done that before.

there are all sorts of "tricks" and different things you can try

Answer 15

C is what I would go with

Answer 16

j'ai d'accord