greend0719
04.04.2020 •
Mathematics
Determine the value of y, if x is -1.
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CE
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y = |x| – 7
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Ответ:
x= 20
Step-by-step explanation:
4x-10+2x-20=90
Combine like terms
6x -30 = 90
Add 30 to each side
6x-30+30 = 90+30
6x = 120
Divide each side by 6
6x/6 = 120/6
x = 20