Answer:
(0,6)
Step-by-step explanation:
The given system of equations is

and

We substitute the first equation into the second equation to get:

We expand to get:

We group similar terms to get:



Put x=0 in to the first equation to get:

Therefore the solution is (0,6)
B is false but C and D are true
Answer:
Step-by-step explanation:
Givens
Let the least number = x
Let the largest number = 2x
Let the second number = x + 3
The sum = 75
Equation
x + 2x + x + 3 = 75 Combine the terms on the left
Solution
4x + 3 = 75 Subtract 3 from both sides
4x +3-3= 75-3
4x = 72 Divide by 4
4x/4 = 72/4
x = 18
Answer
Smallest number = 18
Second number = 18 + 3 = 21
Largest number = 2*18 = 36
Sum = 75