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# Use x for unknown numbers.I think of a number multiply it by two,then subtract nine?

take ‘x’ you are asked to multiply it by 2 giving you ‘2x’ then you are asked to take away 9 Giving you ‘2x-9’ I always substitute a number in to check that the equation works at the end  Rose Smith
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1.1k students helped

Take the unknown to be ‘x’ and multiply it by 2. This gives you 2x,from which you are being asked to subtract 9. FINAL ANSWER 2X-9 This would be your final answer unless you’ve been asked to substitute and solve and equation. Hope I helped  DJ McNeish
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578 students helped

Your unknown would be 'x' therefore the expression would be 2x - 9  ·

1.5k students helped

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