If f(x) = -3x - 2; Find f(x)
2 answers:
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Answer:
Substitution property of equality
Step-by-step explanation:
Given
and
Then
Required
State the property
From the list of options, (d) answers the question.
This is so because:
Substitution property of equality states that
If then
In other words, both can replace one another.
So if , then 2y + 1 can be substituted for x in
So:
becomes
<em>Hence, it is substitution property of equality</em>
If the unknown value is x, then x = × 6 = 21.
Explanation:
- Since it is a double number line with a ratio, all the ratios of one number line to the other will remain equal for all the values along both the number lines. Assume the unknown value to be x.
- The ratio of the number on the first number line to the corresponding number on the second number line is calculated to be;
=
=
=
=
= 3.5. So
- We can also calculate x by the following method. As ratios are equal we can directly substitute the value to another ration. So
= 21.