exam Maths Puzzle Numerical Ability

i need help in that question. y=-2x+5. the topic is use function notation to write an equivalent equation

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exam Other Question

Looking to verify adding (or subtracting) logarithms to a single logarithm. I have: "log 5 250 - log 5 10". I believe that if they are the same base, you can simply substract the 250 from 10 to equal 240 (e.g. log 5 240). Right? Thanks in advance. Solve for y: y-4y^1/2-5=0