jazmin82
jazmin82 jazmin82
  • 16-07-2019
  • Mathematics
contestada

What should be the first step in adding these equations to eliminate y
8x+3y= 2
+ 4x-by=-7

Respuesta :

altavistard
altavistard altavistard
  • 16-07-2019

Answer:

Step-by-step explanation:

Are you sure you wanted that "b" in the second equation?

If so, here's how we eliminate y:

1) Multiply the first equation by b:  8bx + 3by = 2b

2) Multiply the second equation by 3:  12x - 3by = -21

3) Combine these two results.  We get:

(8b + 12)x = 2b - 21

Here we have eliminated  y, but still have an equation in two variables, b and x.

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