# How do you solve the rational equation #2/a = 4#?

Multiply both sides by a giving:

To make sure that initially you do not get in a muddle write this as:

By the laws of mathematics you can do this next bit:

See the way I have swapped the bottom numbers of the fractions around!

so we end up with:

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the first step in solving this equation is to 'cross multiply'

hence : 4a = 2

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To solve the rational equation 2/a = 4, you can cross-multiply and solve for a. Multiply both sides of the equation by a to eliminate the denominator. This gives you 2 = 4a. Divide both sides of the equation by 4 to isolate the variable a. The solution is a = 1/2.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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