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
mote1985 [20]
3 years ago
6

4) Solve each pair of simultaneous equations.

Mathematics
1 answer:
Mkey [24]3 years ago
7 0
4) a. x+y=1–(1)
y=2x-8—(2)
(2) into (1)
x+(2x-8)=1
3x-8=1
3x=1+8
x=9/3
x=3—(3)
(3) into (2)
y=2(3)-8
y=-2

ans x=3, y=-2

b. x+y=19—(1)
y=5x+1—(2)

(2) into (1)

x+(5x+1)=19
6x+1=19
6x=19-1
x=18/6
x=3—(3)

(3) into (2)

y=5(3)+1
y=16

ans x=3, y=16

c.x+y=-2—(1)
y=x-10—(2)

(2) into (1)

x+(x-10)=-2
2x-10=-2
2x=-2+10
x=8/2
x=4–(3)

(3) into (2)
y=4-10
y=-6

ans x=4, y=-6


5) 3x=y—(1)
x=y-16–(2)

(2) into (1)

3(y-16)=y
3y-48=y
2y=48
y=48/2
y=24–(3)

(3) into (2)

x=24-16
x=8

ans x=8, y=24
You might be interested in
A woman bought a coat for $99.95 and some gloves for $7.95. If the sales tax was 7%, how much did the purchase cost her? (Round
FrozenT [24]

Answer: $115.5

Step-by-step explanation:

The woman bought a coat for $99.95 and some gloves for $7.95. This means that the total amount of money that the woman would have paid for the coat without tax is

99. 95 + 7.95 = $107.9

If the sales tax was 7%, then the amount paid as sales tax would be

7/100 × 107.9 = 0.07 × 107.9 = $7.553

Therefore, the amount that she would pay to purchase the coat and the gloves is

107.9 + 7.553 = 115.453

= $115.5 rounded up to the nearest cent.

3 0
2 years ago
Read 2 more answers
If A store had 100 toys 2398 x more how many is that
yuradex [85]

Answer:

Answer is 239,800.

6 0
3 years ago
Help! Please. I don’t know what I did wrong.
Debora [2.8K]

Answer:

1320, permutation

Step-by-step explanation:

There are 12 members

Pick a president

We have 12 choices

Now there are 11 people left to pick from

now pick a vp

We have 11 choices

Now there are 10 people left to pick from

now pick a secretary

We have 10 choices

12*11*10 = 1320

This is a permutation since it matters who is president, vp and secretary

6 0
3 years ago
Find missing angleeeeeeeeeeeeeeeeeeeeeeee​
dimulka [17.4K]

Answer:

C) 80

Step-by-step explanation:

triangles always add up to 180 degrees, so 80+20=100 the missing angle is 80 degrees

4 0
2 years ago
As part of a science experiment, Greta measured the amount of water flowing from Container A to Container B. Container B had hal
Morgarella [4.7K]

Answer:

2 1/2 gallons

Step-by-step explanation:

add the flow plus the original number

5 0
3 years ago
Other questions:
  • Using the following diagram, solve for x.
    14·2 answers
  • ALEX HAD 45 TOY CARS.HE PUT 26 TOY CAR IN THE BOX. HOW MANY TOY CARS ARE NOT IN THE BOX ?
    15·1 answer
  • What value added to x2 + 2x would complete the square
    15·2 answers
  • P is the centroid of XYZ. If XU = 57 what is PU? A. 38 B. 19 C. 28.5 D. 20​
    13·2 answers
  • How do you simplify -5x-x+14x-3x
    6·2 answers
  • If you bought a stock last year for a price of $98, and it has gone down 17% since
    13·2 answers
  • Which equations are true?
    7·1 answer
  • Jake needs 7.59 meters of wood to complete a school project. He buys a 2.21−meter plank of wood and a 3.12−meter plank of wood.
    15·1 answer
  • What's the answer????
    15·1 answer
  • Can anyone help me with this , it’s a test and it’s due in 20 minutes!!! help someone
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!