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3 years ago

What is the value of the function y=3x−1 when x=−1 ? −8 −4 2 6

Mathematics

2 answers:

lara31 [8.8K]3 years ago

6 0

Answer:

Option B is correct

Value of the function $y =3x-1$ when x =-1 is -4

Step-by-step explanation:

Given the function: $y =3x-1$ ......[1]

Here, x is the input value and y is the output value.

Substitute the input value of x = -1 in [1]

$y =3(-1)-1$

⇒ $y =-3-1$

⇒ $y =-4$

Therefore, the value of the function $y =3x-1$ when x = -1 is -4

Paraphin [41]3 years ago

3 0

Substitute x for -1 in y=3x-1
y = (3) (-1) -1
Solve
y = (3) (-1) -1
y = -3 - 1
y = -4

B.) -4 is your answer

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3 years ago

150 - x = 87 what does x equal here ?

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Answer:

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Step-by-step explanation:

Subtract by 150 from both sides of equation.

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The perimeter of a rectangle is 42 inches, and its area is 110 square inches. find the length and width of the rectangle.

lorasvet [3.4K]

$p = 2w + 2l$ $p = 42$
$a = l * w$ $a = 108$

You want to make either the length or width variable (I chose the width variable to be by itself. It doesn't matter) by itself by:

Divide both sides by 2.
(p) ÷ 2 = (2w + 2l) ÷ 2
$2's$ $cancel$ $out$
$\frac{p}{2} = w + l$

Subtract both sides by either length or width depending on what variable you chose to make by itself (in this case I subtracted the length variable because I wanted the width variable by itself).
$\frac{p}{2} - l = w + l - l$
$l's$ $cancel$ $out$
p/2 - l = w

$a = l * w$

You replace w with the equation above p/2 - l = w
$a = l( \frac{p}{2} - l)$

Multiply out the L.
$a = \frac{p}{2}l - l^{2}$

Plug in all your numbers a = 110 and p = 42
$110 = \frac{42}{2}l - l^{2}$
$110 = 21l - l^{2$

Move everything to the left side so $l^{2}$ would be positive (makes the equation easier when $l^{2}$ is positive).
$l^{2} - 21l + 110 = 0$

Factor.
$(l -10)(l-11) = 0$

Make each parenthesis set equal to 0.
$l-11=0$ $l-10=0$

Add.
$l = 11$ $l = 10$

By doing this you solve for both the width and length so the answer is:
w = 11 L = 10

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