exam Maths Puzzle Numerical Ability

i need to differentiate y= -2x�+4x+7

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Solve graphically: x + y = 8 and x + y = 3
x = y = 8 x - y = 7 Hi Can I have some help with the following problem?

Biologists have observed that the chirping rate of crickets of a certain species is related to temperature, and the relations