All categories

3 years ago

Solve the following system of equations. -x-2y=7 and 7x+2y=-25

Mathematics

2 answers:

ivanzaharov [21]3 years ago

5 0

Answer:

-x-2y=7

x=−2y−7

x=-2/7y+-25/7

-2/7y+-25/7=−2y−7

y=−2

x=−2(−2)−7

x=−3

x=-2/7(−2)+-25/7

x=−3

x is -3 and y is -2

(-3,-2)

Hope it helps

polet [3.4K]3 years ago

4 0

Answer:

Point Form: (-3,-2)

Equation Form: x = -3, y = -2

Step-by-step explanation:

I think this is the answer

You might be interested in

MATH HELP!!! 100PTS!!!

Lostsunrise [7]

Answer:

$x =\dfrac{20 +\sqrt{454}}{18}, \quad \dfrac{20 -\sqrt{454}}{18}$

Step-by-step explanation:

Given functions:

$p(x)=2x-4$

$r(x)=\dfrac{6x-1}{9x+1}$

Solve for p(x) = r(x):

$\begin{aligned}p(x) & = r(x)\\\implies 2x-4 & = \dfrac{6x-1}{9x+1}\\(2x-4)(9x+1)&=6x-1\\18x^2+2x-36x-4&=6x-1\\18x^2-40x-3&=0\end{aligned}$

As the found quadratic equation cannot be factored, use the Quadratic Formula to solve for x:

Quadratic Formula

$x=\dfrac{-b \pm \sqrt{b^2-4ac} }{2a}\quad\textsf{when }\:ax^2+bx+c=0$

Therefore:

$a=18, \quad b=-40, \quad c=-3$

Substitute the values of a, b and c into the quadratic formula and solve for x:

$\begin{aligned}\implies x & =\dfrac{-(-40) \pm \sqrt{(-40)^2-4(18)(-3)} }{2(18)}\\\\& =\dfrac{40 \pm \sqrt{1816}}{36}\\\\& =\dfrac{40 \pm \sqrt{4 \cdot 454}}{36}\\\\& =\dfrac{40 \pm \sqrt{4}\sqrt{454}}{36}\\\\& =\dfrac{40 \pm2\sqrt{454}}{36}\\\\& =\dfrac{20 \pm\sqrt{454}}{18}\end{aligned}$

Therefore, the solutions are:

$x =\dfrac{20 +\sqrt{454}}{18}, \quad \dfrac{20 -\sqrt{454}}{18}$

Learn more about quadratic equations here:

brainly.com/question/27750885

brainly.com/question/27739892

6 0

2 years ago

Which measure is most appropriate to describe the center of the data in the stem-and-leaf plot below?

FrozenT [24]

Answer:

median

Step-by-step explanation:

The centre of every data set is the second quartile/50th percentile/median

3 0

3 years ago

Read 2 more answers

A 3 gallon jug of water cost $11.04. what’s the price per cup?

fiasKO [112]

Answer: one gallon jug of water cost’s $3.68

7 0

2 years ago

Pls help me with this (12 and below) with correct answers (SHOW WORK AND EXPLAIN) thanks lots of points

SashulF [63]

I can do the first part, but the second part is confusing...
------------------
Find out how many plates Mike can pack in a minute.
60 (an hour) / .75 (3/4) = 45
180 / 45 = 4

Mike can pack 4 plates per minute.

Since Mike only packs 4 ppm, Lucy packs faster, with 5 plates per minute!

5 0

3 years ago

The right triangular prism has a volume of 1152 cm 3

aev [14]

D: 16, but if you really want to know how to do this you must figure out that A=MX+B and then using that you can calculate the meaning of life and how ALIENS helped build the twin towers. enjoy :)

3 0

3 years ago

Read 2 more answers