Question

Write a rule for the linear function in the table.

f(x) = 4x + 3
f(x) = -4x - 3
1
f(x) = x + 3

Answer 1

The rule for the linear function in the table is y = x + 3

Write a rule for the linear function in the table.

From the question, we have the following parameters that can be used in our computation:

x y

0 3

1 4

2 5

3 6

A linear function is represented as

y = mx + c

Where

c = y, when x = 0

This means that

y = mx + 3

Using the point (2, 5) on the table, we have

2m + 3 = 5

2m = 2

Evaluate

m = 1

So, we have

y = x + 3

Hence, the rule for the linear function in the table is y = x + 3

Question

Write a rule for the linear function in the table.

f(x) = 4x + 3

f(x) = -4x - 3

f(x) = x + 3

x y

0 3

1 4

2 5

3 6

Answer 2

I guess that you want to know the transformations:

We start with:

f(x) = y = 4*x + 3

a)the transformed function is:

f(x) = y = -4*x - 3

So the sign changed.

This means that we go from (x, y) to (x, - y)

This is a reflection over the x-axis which changes the sin of the y component.

b) Now we go to f(x) = 4*x + 3

So the coefficient in the leading term changed.

This is a horizontal contraction:

A horizontal contraction of factor K for the function g(x) is: g(K*x)

In our case, we have:

f(K*x) = 4*(k*x) + 3 = x + 3

4*k*x = x

4*k = 1

k = 1/4

Then the transformation is an horizontal contraction of scale factor 1/4.