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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