When you use the linear combination method, how can you tell whether you have to multiply by a constant first?

The point of the "linear combination method" is to eliminate one of the variables. If a variable can be eliminated without multiplying by one or more constants, then you do not have to multiply by a constant first.

For example, given the system ...

We can eliminate y simply by adding the equations. We can eliminate x by subtracting one equation from the other. (You might say you need to multiply one of the equations by -1 before you add them in order to eliminate x.)

Now, consider the system ...

Neither variable can be eliminated by simply adding or subtracting one equation to/from the other. One of the equations must be multiplied by -2 or -1/2 before being added to the other to eliminate a variable.

Coefficients in one equation are neither equal to nor opposite the corresponding coefficients in the other equation, so multiplication by a constant is necessary.

$450.00 for 6 weeks

or

$300

step-by-step explanation:

$200.00 for first week $50.00 x5 equals $250 plus $200 equals $450.00 for six weeks.

$200 for first week

$200 x 0.10 = $20

$20 x 5 = $100

$200 + $100 = $300

gmt is 4 hrs ahead of edt so just add four hours to 1: 14: 20 (minutes and seconds stay the same)

gmt is 5: 14: 20

hope this !

~just a girl in love with shawn mendes