exam Maths Puzzle Numerical Ability

Write the equation of the line that has a slope of negative 2 and passes through the origin

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exam Other Question

simplify:

(x^2+2*x-35)/x^2-7*x+12 divided by (x^2-13*x+40)/3*x^2-12*x

thanks,
Chris:) im stumped i took the basic algebra at comm college a few years ago and someone posed 2x+7=10 yes im being stupid but please help
Jon