Book Maths Puzzle Co-ordinate geometry

What is the slope of a line passing through (2,3) and (4,1)?

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Book Other Question

How do you arrive at an answer when a maths question is worded as follows?

1. 6 is ____________% of 20.

2. 10% of 20 is ____________.
The difference between the measures of two complementary angles is 58 degrees. What is the measure of the two angles if using two variables (x and y).

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