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3 years ago

Solve using substitution -5x+7y=-5 y=-5 x=?

Mathematics

1 answer:

Lostsunrise [7]3 years ago

7 0

So if you solve for x using the first equation, you get: x = 5y - 5.

From there you can plug that into the second equation which would give you:

7y-5y+5=-23

Simplifying from that point, you get y = -9.

Now that you have one of the values, you can solve for x by plugging it back into the equation we made (x = 5y - 5) and getting to the answer x = -40.

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The cost in dollars, y, of a large pizza with x toppings from Pat’s Pizzeria can be modeled by a linear function. A large pizza

Lisa [10]

Answer: b. $22.75

Step-by-step explanation:

Given : A large pizza with no toppings costs $14.00. A large pizza with 2 toppings costs $17.50.

Let x denotes the number of toppings and y be the cost of that pizza.

Then, $y=mx+c$ , m= cost per topping and c= cost of pizza without any topping.

From the given information.

c= $14

Function of cost becomes = $y=mx+14$

For x= 2 and y= 17.50, we have

$17.50=m(2)+14$

tex]3.50=m(2)[/tex] [Subtract 14 from both sides]

$m=\$ 1.75$ [Divide both sides by 2]

For c= 14 and m =1.75 , our function becomes.

$y=1.75x+14$

Now, for x= 5

$y=1.75(5)+14=8.75+14=22.75$

Hence, the cost of a pizza with 5 toppings = $22.75

5 0

4 years ago

Read 2 more answers

The graph of f(x) is shown.what is the value of x when f(x)=4

Dmitry [639]

Answer:

X=3

Step-by-step explanation:

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3 years ago

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Vladimir79 [104]

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2 years ago

Which two values of x are roots of the polynomial below? x^2-3x+5

Gemiola [76]

Given:

Polynomial $x^2-3x+5$

To find:

The values of x.

Solution:

$x^2-3x+5=0$

Quadratic equation formula:

$$x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}$

Here $a=1, b=-3, c=5$ .

Substitute the values in the formula, we get

$$x=\frac{-(-3) \pm \sqrt{(-3)^{2}-4 \cdot 1 \cdot 5}}{2 \cdot 1}$

$$x=\frac{3 \pm \sqrt{9-20}}{2}$

$$x=\frac{3 \pm \sqrt{-11}}{2}$

$$x=\frac{3 - \sqrt{-11}}{2} \ \text{and} \ x=\frac{3 + \sqrt{-11}}{2}$

Option E and option F are the roots of the polynomial.

The values of x are $x=\frac{3 - \sqrt{-11}}{2} \ \text{and} \ x=\frac{3 + \sqrt{-11}}{2}$ .

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3 years ago

The circumference of a tire is 31.4 inches. What is the radius of the tire?

Helga [31]

Answer:

Step-by-step explanation:

The circumference of the circle is C=2*3.14*r

r=C/(2*3.14)

r=31.40/(2*3.14)=5

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3 years ago