Question

Solve 9x-y=45, solve for y

Answer 1

9x - y = 45....subtract 9x from both sides
-y = -9x + 45 ...multiply both sides by -1 to make y positive
y = 9x - 45 <==

Answer 2

Answer:  " y =  9x - 45 " .
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Explanation:
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Given:  9x - y = 45 ;

Method 1)
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Multiply the entire equation (both sides) by "-1" ; 

-1* {9x - y = 45} ;

to get:  -9x + y = -45 ;

↔ y + (-9x) = -45 ;

→ y - 9x = -45 ;

Add "9x" to each side of the equation ; to isolate "y" one side of the equation; and to solve for "y" ;

  y - 9x + 9x = -45 + 9x ;

y = -45 + 9x ;

→ y = 9x + (-45) ;

→ y = 9x - 45 .
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Method 2) 
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Given:  9x - y = 45 ; Solve for y ;

Add "y" to each side of the equation; and Subtract "45" from each side of the equation:

9x - y + y - 45 = 45 + y - 45 ;

to get:  9x - 45 = y ;

↔ y = 9x - 45 .
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