In the equation y=8​x, y varies directly as x. When x=5​, y=40. What is the value of y when x=10​?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.5: Multiplication With The Addition-or-subtraction Method
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In the equation y=8​x, y varies directly as x. When x=5​, y=40. What is the value of y when x=10​?

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