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soldier1979 [14.2K]
3 years ago
8

The table shows a linear function. which equation represents the function?

Mathematics
1 answer:
Bas_tet [7]3 years ago
8 0

Answer:

Option C is correct.

The equation f(x)= -\frac{1}{2}x +4 represents the function.

Step-by-step explanation:

Using slope intercept form to find the equation of line :

For any two points (x_1, y_1) and  (x_2, y_2) the equation of line is given by:

y -y _1 = m(x-x_1) ......[1] ;where m is the slope given by:

m = \frac{y_2-y_1}{x_2-x_1}

Consider any two points from table :

let (4, 2) and (0, 4) be any two points.

calculate slope:

m = \frac{y_2-y_1}{x_2-x_1}= \frac{4-2}{0-4}

m = \frac{2}{-4} = -\frac{1}{2}

Now, substitute in equation [1]  we have:

y - 2 = -\frac{1}{2} (x-4)

Distributive property i.e,  a\cdot (b+c) = a\cdot b + a\cdot c

y -2 = -\frac{1}{2}x +2

Add both sides 2 we get;

y -2+2 = -\frac{1}{2}x+2+2

Simplify:

y = -\frac{1}{2}x+4

Since, y= f(x)

f(x)= -\frac{1}{2}x +4

therefore, the equation f(x)= -\frac{1}{2}x +4 represents the function.


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Which of the following shows 9x2y - 4x + 3y3x - 2y2 written in standard form?
Bad White [126]

Answer:

option (4) is correct.

the given expression 9x^2y-4x+3y^3x-2y^2  can be written in standard form as 3y^3x+9x^2y-2y^2-4x.

Step-by-step explanation:

The Standard form of writing an equation,  

1) Look at the degree of each term.

2)  You then write each term in order of degree, from highest to lowest, left to right..

3) The expression x^2y has an exponent of 2 on the x and an unwritten exponent of 1 on the y, so this term is to the third degree (2+1). We add the two degrees together because it has two variables.

Consider the given equation,

9x^2y-4x+3y^3x-2y^2

We have to write it in  standard form using the steps stated above,

first we find the degree of each term in the given expression,

The expression x^2y has an exponent of 2 on the x and an unwritten exponent of 1 on the y, so this term is to the third degree (2+1).

The expression y^3x has an exponent of 3 on the y and an unwritten exponent of 1 on the x, so this term is to the third degree (3+1).

So the highest degree in the given expression is  3y^3x

write each term in order of degree, from highest to lowest, left to right.

following this , we can write the expression as,

3y^3x+9x^2y-2y^2-4x

Thus, option (4) is correct.




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