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diamong [38]
3 years ago
9

What is the value of the expression

Mathematics
1 answer:
Natalija [7]3 years ago
3 0

Answer:

f(- 3) = - 27

Step-by-step explanation:

substitute x = - 3 into the expression

f(- 3) = 9 + (12 × - 3 ) = 9 + (- 36) = 9 - 36 = - 27


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<h2>Answers:</h2>

Question 1: The equations share the same slope, but different y-intercepts.

Question 2: Option B (y = 2x + 1)

<h2>Explanations:</h2><h3>For Question 1:</h3>

Both equations are written in slope intercept form.

y = mx+b\\\\\text{m - slope}\\\text{b - y-intercept}

The equations we have are:

\left \{ {{y=2x} \atop {y=2x-7}} \right.

Both equations share the same slope of 2. However, they have different y-intercepts.

y = 2x can be written as y = 2x + 0.

Usually if you only have the slope in your equation then the y-intercept is the origin, or (0, 0).

The second equation's y-intercept is -7. It takes 'b's place.

<h3>For Question 2: </h3>

We are given a graph and we need to find a equation.

According to the graph, the line passes at (0, 1). 1 is the y - intercept.

Since y = 2x + 1 is the only option with 1 as the y - intercept, it should be the correct answer.

I'll do the slope as well to verify our answer.

I will use the points (-1, -1) and (1, 3).

m=\frac{3-(-1)}{1-(-1)}=\frac{4}{2} =\boxed{2}

The correct answer should be y = 2x+1.

Hope this helps you.

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If John ran a 5-kilometer marathon how long was that in meters?
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