PLEASEE HELPP Which system of equations would be best solved using Substitution?
1. -2x + 5y = -1
2x + 5y = 11

2. 2x = 10
y=-3

3. 3x + 7y= 21
4x – 3y = -9

4. y=2/3x+5
2x - 6y= -42

Step-by-step explanation:

1. The best way to solve this one would be elimination

  Both the equations have the same term, 5y

  Since neither variable is isolated, it wouldn't be easy to use the method of substitution

2. Both the equations only have x or y

   SInce neither of the equations has both the variables, substitution is impossible

3. Same as 1, just that you would need to multiple one of the equations by a certain number to create equal terms to make elimination possible

4. It's perfect!!! The y is isolated and it would be simple to just substitute the first equation into the 2nd (I hope you got what I meant)

4, is the correct answer

I hope this helps!!!

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.

step-by-step explanation: