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
makvit [3.9K]
3 years ago
12

Find the solution of this system of equations 4x - 5y = -12 -X + 5y = 18

Mathematics
1 answer:
Natalka [10]3 years ago
7 0

4x - 5y = -12

-x + 5y = 18

Add the equations together:

4x + -x = 3x

-5y + 5y = 0

-12 + 18 = 6

So now you have:

3x = 6

Divide both sides by 3:

X = 2

Now you have the value of x, replace x with 2 in one of the equations and solve for y:

4(2) -5y = -12

8 -5y = -12

Subtract 8 from both sides:

-5y = -20

Divide both sides by -5:

Y = 4

The solution is x = 2 and y = 4 which is written as (2,4)

You might be interested in
bookstore ordered 1,528 packs of pens and 1,823 packs of pencils at the prices shown. how much did the bookstore spend on pens?
IgorC [24]
I found that the given prices are $ 4 per pack of pens and $ 3 per pack of penciles.

The question is how much the bookstore spent on pens.

Then you have to multiply the number packs of pens, which is 1,528, times the price per pack pens which is $ 4.

So, the answer is: 1528 packs of pens * $ 4 / pack of pens = $6112.


8 0
3 years ago
determine if the ordered pair is a solution of the equation is (2 4) a solution of y = -3× - 2? true or false​
vesna_86 [32]

Answer:

False

Step-by-step explanation:

y = -3× - 2

4 = -3(2) - 2

4 = -6 - 2

4 = -8

4 0
3 years ago
What are the steps to solving this limit?
patriot [66]

Answer:

lim(x---->0) = -5

Step-by-step explanation:

first: sin(x-π/2)= -cosx

so the equation will be :

lim(x---->0) = [-6cos(ax)-1}/cosx

solve :

lim(x---->0) =  [-(6cos(a(0))-1}/cos(0)

cos0=1

lim(x---->0)=(-(6(1)-1)/1

lim(x---->0)=-6+1/1

lim(x---->0)=-5

6 0
3 years ago
Read 2 more answers
The annual household cost of telephone service in the US increased at a relatively constant rate of $27.80 per year from 1981 to
Serjik [45]
B: 914-20(27.80)=X, multiply: 20(27.80)=556, 914-556=$358 :A.

C: 914-27.80=$886.20 :)
3 0
3 years ago
Which one answers this equation
alexgriva [62]
/ (divided by) I think it is right
3 0
2 years ago
Other questions:
  • What is the mode of the data set?<br> 26, 29, 26, 29, 43, 29
    13·2 answers
  • In the equation for a confidence interval, the sample size is located in the denominator underneath the radical sign. What happe
    14·1 answer
  • Point (5 5/8, 2 1/4) lies on a line that represents a proportional relationship. Write an equation for this relationship. What i
    15·1 answer
  • If 1/4<br> inch equals 50 miles, find the miles represented by 4 1/2<br> inches.
    15·2 answers
  • I need help ASAP.I need help graphing this problem
    6·1 answer
  • we have 10 computers ,2 don't work and your friend is using one. how many computers are free t ok use?​
    13·2 answers
  • What is the quotient of 12 and -1/2
    7·1 answer
  • ANSWER ASAP FOR BRAINLIEST<br> THANKS
    7·2 answers
  • Can someone help? (with all)
    13·2 answers
  • Geometry I need help ASAP please
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!