Question

Which of the following equations could be the result of using the comparison method to solve the system shown?

x + y = 5
2x + y = 7


-x - 5 = 7 - 2x
5 - x = 7 - 2x
5 - x = 2x - 7


got b

Answer 1

I don't recognize the term " comparison method" but may know it as Addition/Subtraction or something else. What is " comparison method?" Let me know and then I'll see what I get as an answer.

Answer 2

one sec.... let me find it in my lesson

Answer 3

Example:
Solve the following system of equations by the comparison method.

2x + 6y + 3 = 0
x - 4y - 9 = 0

Solution:
Make y the subject of each equation; then solve each equation:



Reminder:
Cross-multiply to solve a proportion.
Combine the two results into a single equation of the results and find the value of x:



Substitute 3 in for x into one of the original equations and solve for y:
2(3) + 6y + 3 = 0
6 + 6y + 3 = 0
6y + 9 = 0
6y = -9
y = -

The checks were shown above.

Therefore, the solution set is {(3, -)}

Answer 4

crap the fractions didnt show up

Answer 5

x + y = 5 --> y = 5 -x

2x + y = 7 --> y = 7 - 2x
--------------------------
So, 5-x = 7 - 2x ---------------------> This is what I got.

That technique is what I know as substitution.
That may not be the same as comparison.

Answer 6

According to the instructions and the options given, the answer is not the solution to the two equations but just what you get after you set the two y expressions equal.

>>>Solution: Make y the subject of each equation;

So, the answer I see as correct is the one you asked about, B.

5 - x = 7 - 2x