270∙7÷9−360÷(20÷5)+(42∙6÷7+14)
2 answers:
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Given:
The diagram of triangle DEF and triangle D'E'F' on a coordinate plan.
To find:
The algebraic representation of the dilation.
Solution:
The vertices of triangle DEF are D(0,7), E(7,-7) and F(-7,-7).
The vertices of triangle D'E'F' are D'(0,2), E(2,-2) and F(-2,-2).
We know that, the dilation factor is:
For point D' the y-coordinate is 7 and for point D the y-coordinate is 2. So,
The rule of dilation is:
The algebraic representation of the dilation is .
Therefore, the correct option is b.