Question #01d14

1 Answer
Daniel L.
Jan 12, 2017

To check your answer substitute the calculated value for the unknown. See explanation.

Explanation:

To check if your value is a solution of the given equation you have to substitute the calculated value for the variable and see if left side equals right.

Example 1

Suppose you got #5# as an answer. If you substitute it you get:

#3*color(red)(5)+5=20#

#15+5=20#

#20=20#

Left side equals right so the answer is correct.

Example 2

Now let's suppose that you got #3# as the answer. If you substitute you get:

#3*color(red)(3)+5=20#

#9+5=20#

#14=20#

Left side DOES NOT equal right, so the answer #3# is incorrect.

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