Need evaluate the expression 5x - 7 for x =9? what is the answer?

An expression involving a variable is a way to express an idea, rather than a specific number. So, writing means that there is a certain quantity, x, and you want to multiply it by 5, and then subtract 7.

Note that we don't want to know the value of x, we're only saying that we will multiply it by 5 and then subtract 7.

So, if we know that x=9, we will multiply it by 5 and then subtract 7:

10 glasses of juice could be made with 5 carrots, 1,500 orange juice, 2,000 papaya juice.

4th option is correct xy=-10

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