Anonymouslizard
Anonymouslizard
17.07.2019 • 
Mathematics

Which of the following is an equation of a line that is perpendicular to y = 3 x + 18 ? (choose all correct equations.)
y = − 1 3 x + 1
y = 1 3 x + 4
15 x + 5 y = 60
7 x + 21 y = 105

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