18.
For which system of equations would elimination be the simplest technique to choose?
(Points : 2)

y = 2x and x + 3y = 5

4x + 3y = 6 and 3y = 5

x + y = 7 and x - y = 12

3x - 2y = 8 and 4x - 5y = 20

19.
Substitution would be the simplest method of solution for which system?
(Points : 2)

5/3 x = 6y and 2x -3y = 8

y = 2x and x + y = 28

3x - 2y =18 and 4x + 5y =60

20.
The sum of two numbers is 110. Their difference is 28. What is the smallest of the two numbers?
(Points : 2)

56

41

Question

18.
For which system of equations would elimination be the simplest technique to choose?
(Points : 2)
      
y = 2x and x + 3y = 5

      
4x + 3y = 6 and 3y = 5

      
x + y = 7 and x - y = 12

      
3x - 2y = 8 and 4x - 5y = 20


19.
Substitution would be the simplest method of solution for which system?
(Points : 2)
      
5/3 x = 6y and 2x -3y = 8

      
y = 2x and x + y = 28

      
3x - 2y =18 and 4x + 5y =60


20.
The sum of two numbers is 110. Their difference is 28. What is the smallest of the two numbers?
(Points : 2)
      
56

      
41

anonymous · Answer

18. 
4x + 3y = 6 and 3y = 5  because 3y=5 can be sub. into the first equation directly

19.
y = 2x and x + y = 28 because y=2x can be sub. into x+y=28 directly

20.
x+y=110
x-y=28
By solving these two equations, 
x=69, y=41
so, 41 is the smallest one

anonymous · Answer

Oh thank you so much CoCO Tsoi :)

anonymous · Answer

You are welcome :D