exam Maths Puzzle Numerical Ability

How do I write an equation of a line with
a slope of -2 and y interecept (0,0).

Thanks

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exam Other Question

Area of a painting. A rectangular painting with a width of x centimeters has an area of x^2 + 50x square centimeters. Find a binomial that represents the length. I need help with simplifying:
3/x+1 + 3
/ divided by 3x/x-1 -3.