SOLUTION: 1. ax + by = c Solve for x. 2. Four less nine times a number is one hundred twenty-two. Find the original number.

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1. ax + by = c Solve for x.
ax + by = c original
ax = -by + c subtract by from each side
x = (-by + c)/a divide each side by 'a'
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2. Four less nine times a number is one hundred twenty-two. Find the original number
9x-4=122 original equation
9x = 126 add four
x = 14 divide by nine on each side