hajoshh
17.12.2020 •
Mathematics
PLEASE ANSWER THIS QUESTION RIGHT Is (4,5) a solution to the system of equations?
4x+y=21
-3x-6y=10
The answer choices are in the picture above
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Ответ:
Step-by-step explanation:
x²-10x = 12
Coefficient of the x term: -10
Divide in half: -5
Square it: (-5)² = 5²
Add 5² to both sides:
x²-10x+5² = 12+5²
(x-5)² = 37