exam Maths Puzzle Numerical Ability

solve each system using substitutions

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exam Other Question

Kristy can mow a lawn in 1 hour less time than her brother steven. together they can fiinish in 5 hours. how long would it take kristy if she worked alone If you were to solve x^2 - 5x = 6 by factoring, which step would result?

I got:
(x+6)(x-1)=0

Thanks~