Question

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


69


55

Answer 1

19) The second system.

Answer 2

20) Solve it like a system
x + y = 110
x - y = 28

x = y + 28 ----> x + y = 110
y + 28 + y = 110
2y + 28 = 110
2y = 82
y = 41

x+ y = 110
x + 41 = 110
x = 69

Choice 2) 41

Answer 3

FOR 2nd question: x+y=110,
x-y=28, by adding them:
2x=138
x=138/2=69
y=110-x=110-69=41
x=69, y=41