Catch the Hidden Number
A number x is multiplied by 3, then 5 is added. The result is the same as 2 less than double the number.
Find x.
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Multiply by 3, then add 5 gives: 3x + 5
ReplyDelete“2 less than double the number” means: 2x - 2
So: 3x + 5 = 2x - 2
Subtract 2x from both sides: x + 5 = -2
Subtract 5 from both sides: x = -7
Check:
3(-7) + 5 = -21 + 5 = -16
2(-7) - 2 = -14 - 2 = -16
Both match, so x = -7