# How do you solve the system #-4x+ y =6# and #-5x - y =21# by substitution?

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To solve the system (-4x + y = 6) and (-5x - y = 21) by substitution:

- Solve one of the equations for one variable in terms of the other variable.
- Substitute the expression obtained in step 1 into the other equation.
- Solve the resulting equation for the remaining variable.
- Substitute the value found in step 3 back into one of the original equations to find the value of the other variable.
- Check the solution by substituting both values into both original equations to ensure they satisfy both equations.

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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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