Solve using the addition method. What is the y-value of the solution to the system?

2x - 3y = -1
3x + 4y = 24

Question

Solve using the addition method. What is the y-value of the solution to the system?

2x - 3y = -1
3x + 4y = 24

anonymous · Answer

Solve using the addition method. What is the y-value of the solution to the system?

2x - 3y = -1
3x + 4y = 24
 	
	4
	3
	2
	none of the above

anonymous · Answer

you have to multiply one or both of those equations by a number in order to get eliminate

anonymous · Answer

mult 1st one by 3:  6x - 9y = -3
mult 2nd one by -2: -6x + -8y = -48

now add them together

-17y = -51

divide by -17 on both sides to determine value of y

y = 3

anonymous · Answer

alright so how would you do this 
If you were to solve the system using the addition method, what would you multiply the first equation by in order to make the y's add out of this system?

-2x + 3y = 6
7x - 6y = 8

anonymous · Answer

look at the Y's...what can be multiplied by one or both of them to cancel each other out

anonymous · Answer

-3

anonymous · Answer

which one is to be multipled by -3?

anonymous · Answer

the y's

anonymous · Answer

which equation?  You will multiply that number by EVERY term in THAT equation.

anonymous · Answer

the top

anonymous · Answer

how would it look

anonymous · Answer

oh, sorry - the question asks you for the first equation.  Yes that is correct -3 will allow you to cancel out the term of Y

anonymous · Answer

right so is my final answer -2

anonymous · Answer

-2x + 3y = 6
7x - 6y = 8

mult 1st by 2 : -4x +6y = 12
orig 2nd          : 7x-6y = 8

now add :        3x = 20
 x = 20/3

you should multiply by 2 NOT -3

anonymous · Answer

right so is y 2??

anonymous · Answer

or 4

anonymous · Answer

The question asks - what # do you multiply 1st equation to cancel the Y
-2x + 3y = 6       MULTIPLY BY 2
7x - 6y = 8



Remeber, in algebra - what you do to one term in an equation - you must do to ALL

anonymous · Answer

okay so what will y end up as

anonymous · Answer

?????????????

anonymous · Answer

Y is eliminated - it cancels out....
x = 20/3

now to solve for Y - go back to one of the original equation and plug in value of X - solve for Y

anonymous · Answer

The objective of this is to eliminate or cancel out a term in order to solve for the other one.  This is a method in solving equations simultaneously

anonymous · Answer

so my answers were previously wrong
2
-2
4

anonymous · Answer

help