greystokey
20.08.2019 •
Mathematics
Suppose a and b represent linear expressions.if a + b = 2x -2 and a - b = 4x- 8, find a and b.
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Ответ:
A+B=2x-2
A-B=4x-8
By reduction method
A+B=2x-2
A-B=4x-8
-----------------------
2A=6x-10 ⇒ A=(6x-10)/2 ⇒A=3x-5
A+B=2x-2
-(A-B=4x-8)
-------------------
2B=-2x+6 ⇒ B=(-2x+6)/2 ⇒B=-x+3
A=3x-5
B=-x+3
Ответ:
5x + 11y =39