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
NNADVOKAT [17]
2 years ago
15

Solve the system of equations x+y=-1 and 5x-7y=79 by combining the equations.

Mathematics
1 answer:
Leya [2.2K]2 years ago
6 0

9514 1404 393

Answer:

  (x, y) = (-6, -7)

Step-by-step explanation:

Multiply the first equation by 7 and add that to the second.

  7(x +y) +(5x -7y) = 7(-1) +(79)

  12x = 72

  x = 6

  y = -1 -x = -1 -6 = -7

The solution is (x, y) = (6, -7).

You might be interested in
Find the sum of 3b/b 2 and 12/b 2 and express it in simplest form
alexandr1967 [171]
\frac{3b}{b^{2}} + \frac{12}{b^{2}} = \frac{3b + 12}{b^{2}} = \frac{3(b) + 3(4)}{b^{2}} = \frac{3(b + 4)}{b^{2}}
8 0
3 years ago
ILL MARK U BRILLIANT PLEASE I NEED HELP
ahrayia [7]

Answer:

table, graph or equation

8 0
3 years ago
Solve algebraically. <br> 3x + y =3 <br> Y = 2x - 7
Annette [7]
<span>3x + y =3 
Y = 2x - 7

substitute </span>Y = 2x - 7 into  3x + y =3 
3x + y =3 
3x +2x - 7 =3 
5x = 10
x = 2

Y = 2x - 7 = 2(2) - 7 = -3

answer
(2, -3)


4 0
3 years ago
Read 2 more answers
Explain which variables would be included when using technology to calculate the present value of a lump sum and to calculate th
koban [17]

Answer:

a. Present value of a lump sum =

PV = FV / ( 1 + i )ⁿ

b. Present value of an annuity =

P = PMT x ((1 – (1 / (1 + r)⁻ⁿ )) / r)

Step-by-step explanation:

a. Present Value of a Lump sum =

PV = FV / ( 1 + i )ⁿ

Where variables in the formula are explained as follows

PV = Present Value of the given amount today

FV = Future Value of the given amount

i = Discount rate

n = Number of periods

b. Present value of an annuity is given as:

P = PMT x ((1 – (1 / (1 + r)⁻ⁿ)) / r)

The variables in the equation are explained as the follows:

P = the present value of annuity

PMT = Payment per period or the amount in each annuity payment

r =  the interest or discount rate

n = total number of periods or the number of payments left to receive

8 0
3 years ago
What is this please? i'll give u brainliest
Zolol [24]

Answer:

i dont know i just want points

Step-by-step explanation:

>;)

4 0
3 years ago
Other questions:
  • You deposit 300 in an account earning 6% interest compounded annually. How much will you have in the account in 20 years?
    6·2 answers
  • How do u do these 4 I need to make them a decimal
    13·1 answer
  • Sawyer recorded the number of different types of pets his friends have in the table shown below:
    7·2 answers
  • Suppose that there are two types of tickets to a show: advance and same-day. Advance tickets cost $35 and same-day tickets $30 c
    5·1 answer
  • I have 11 red marbles and 4 blue marbles in a bag if I choose one what color will it be
    7·2 answers
  • PEOPLESS PLEASE HELP WHAT IS 4/5 × 2/3?​
    6·1 answer
  • M gets paid a set rate in his allowance for making his bed every morning. His rate is $0.50 earned for every morning that he mak
    11·2 answers
  • On a test of 80 problems, Bill got 75% of the problema correct.<br> How many did he get correct?
    15·1 answer
  • Find the average of $.85, $1.35, $7, $1.95, and $2.05
    8·1 answer
  • Https://www.analyzemath.com/high_school_math
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!