1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
cluponka [151]
3 years ago
9

(2x + 7y = -2418x+y=12 solve by substitution​

Mathematics
1 answer:
const2013 [10]3 years ago
4 0

Answer:

x = .87, or when approximated to a fraction, 27/31

y = -3.67, or when approximated to a fraction, -1287/350

Step-by-step explanation:

Lets start by rewriting out our equations

2x + 7y = -24

18x + y = 12

Lets solve for a y value; the second equation is easiest, as the y value has no coefficient (the number that is multiplied times a variable). To do this, lets move the 18x to the other side. Now our two equations look like:

2x + 7y = -24

y = -18x + 12

Next, lets plus the second equation into the first equation in regards to y.

2x + 7(-18x + 12) = -24

Now, lets solve!

2x -126x + 84 = -24

Then, combine your terms!

-124x = -108

Divide by (-124)!

x = -108/-124

x = 27/31

Now that we know x, lets plug this back in to the first equation to find y!

2(27/31) + 7y = -24

1.74 + 7y = -24

7y = -25.74

y = -3.67, or when approximated to a fraction, -1287/350

You might be interested in
What is the smallest positive integer x such that 52 divides 98701 + x.​
strojnjashka [21]

Answer: i think 46 im not sure tho

Step-by-step explanation:

5 0
2 years ago
What is the volume of this square pyramid?
tatuchka [14]

Answer: 1296 cm³

Step-by-step explanation:

Since, the volume of a square pyramid is,

V = \frac{a^2h}{3}

Where a = side of the square base,

h = height of the pyramid,

By the given diagram,

a = 18 cm,

h = 12 cm,

Hence, the volume of the given pyramid,

V = \frac{18^2\times 12}{3}

= \frac{324\times 12}{3}

=\frac{3888}{3}

=1296 cube cm.

⇒ First option is correct.

5 0
3 years ago
Two stores are having a sale on T-shirts.Rose spends $63 for three T-shirts from store A and one from store B. Manny spends $140
Digiron [165]
Let a and b be store A and store B, respectively. Then:
3a+b=63
5a+4b=140
So
12a+4b=252
5a+4b=140
7a=112
a=16
b=15
☺☺☺☺
7 0
2 years ago
Factor completely 5ab + 3ay + 5b + 3y. (5b + 3y)(a + 1) (5b − 3y)(a + 1) (5b + 3y)(a − 1) Prime
Katen [24]
<span>5ab + 3ay + 5b + 3y
a(5b + 3y) + 1(5b + 3y)
(a+1)(5b + 3y)
(5b + 3y)(a+1)</span>
7 0
3 years ago
Read 2 more answers
Find the square root of 156.25 by division method
vampirchik [111]
Hello,

I don't know the divison method but is it these one?

156.25= 625/4=(25/2)²

√156.25= 12.5
4 0
3 years ago
Other questions:
  • Simplify the expression show work<br><br> -40/-5
    15·1 answer
  • Lee has a jar of 100 pennies. She adds groups of 10 pennies to the jar. She adds 5 groups. What numbers does she say?
    12·1 answer
  • Which two of the following is continuous data?
    14·1 answer
  • omar has 5 liters of water he divides the water evenly between 4 buckets. how many milliters does omar pour in each bucket
    9·1 answer
  • . Isabella buys a 1.75 litre carton of apple juice. What is the largest number of 200 millilitre glasses that she can have from
    6·1 answer
  • SOMEONE HELP I DONT KNOW WHAT THE HECK IM DOING (7th grade)
    12·2 answers
  • What are the domain and range of the function below? domain: (-40)
    6·1 answer
  • Please help i will mark brainliest!
    11·2 answers
  • Pls help this is the only question I don’t know!
    5·2 answers
  • Plz help me solve this.<br><br> <img src="https://tex.z-dn.net/?f=x%5E%7B2%7D%20%3D%202x%20-%205" id="TexFormula1" title="x^{2}
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!