Help on question THREE . Please also give explanation thank you so much.

Mathematics

1 answer:

Ipatiy [6.2K]3 years ago

5 0

Let the number be x.

double it and add 5
⇒ 2x + 5

The result is 1 less than the number she thought of
⇒ x - 1

Construct the equation to solve for x:
2x + 5 = x - 1
x + 5 = -1 // Take away x from both sides
x = -6 // Take away 6 from both sides

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Answer : The number Tui first thought of is -6.
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