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
xenn [34]
3 years ago
5

Solve each system by elemination, 4x+8y=20 and -4x+2y=-30

Mathematics
1 answer:
ludmilkaskok [199]3 years ago
5 0
The sum of the left side of these two equations is equal to the same of the right side is these two equations
4x+8y + (-4x+2y) = 20 + 30
10y =50 ( x is eliminated)
y=5
Take this into the second equation
-4x +2y = 30
-4x + 2*5 = 30
x=-5

So x=-5
y=5
You might be interested in
How do you do inequalities
fgiga [73]
So some quick tips for inequalities:
**What you do to one side you HAVE TO do it to the other 2**
**If you ever divide a negative number past the inequality signs, the signs FLIP!!**
(e.g. 2>-5x>25)
-2/5 <x < -5

I hope that this has helped!
8 0
3 years ago
Two cities are 45 miles apart. Two trains, with speeds of 70 mph and 60 mph, leave the two cities at the same time so that one i
Sergio039 [100]
8.57 for the first one and, I’m not sure a bout the second time though
7 0
3 years ago
Mrs. Hilt bought 15 books. Sh paid $11 for each book. She later sold all 15 books for $25 each. What is the difference between t
sweet [91]
Total amount of money paid
=11 x 15
=$165

total amount of money sold
=25 x 15
=$375

difference
= 375 - 165
=$210
4 0
3 years ago
How do you figure Mental math 46+14=
Rashid [163]

Answer:

60

Step-by-step explanation:


7 0
3 years ago
Read 2 more answers
To win a trivia game, Nathan must score at least 75 points. Each correct answer is worth 2 1/2 points , and each incorrect answe
Dmitrij [34]

Answer:

He scored 79\frac{1}{2} points.

Step-by-step explanation:

Given:

Number of points for a correct answer = 2\frac{1}{2}

Number of points scored for an incorrect answer = -\frac{1}{4}

Therefore, for 35 correct answers, points scored = 35\times 2\frac{1}{2}=35\times \frac{5}{2}=\frac{175}{2}

Now, for 32 incorrect answers, points scored = 32\times -\frac{1}{4}=-\frac{32}{4}=-8

Therefore, net number of points scored by Nathan is:

\frac{175}{2}-8=\frac{175}{2}-\frac{16}{2}=\frac{175-16}{2}=\frac{159}{2}=79\frac{1}{2}

Therefore, Nathan scored 79\frac{1}{2} points.

3 0
3 years ago
Other questions:
  • For every sale of $50, a company pays its salesperson an incentive of $5.
    11·1 answer
  • Simplify negative 2 and 1 over 9 – negative 4 and 1 over 3.
    12·1 answer
  • Help me with this problem, thank you&lt;3
    6·1 answer
  • How much will it cost someone to finish these 37 problems showing work for every problem. The answers are there but I need to sh
    5·1 answer
  • 2.the solution set of x +y =5 and x-y =3
    7·1 answer
  • Will give brainlest answer
    6·1 answer
  • Find the amount if £1,500 is saved for 3and1/2 years at 10percent per annum​
    15·1 answer
  • Is 0=(x+4)^2-7 rational or irrational
    11·1 answer
  • LAST ATTEMPT! MARKING AS BRAINLIEST!! ( FIND THE SEVEN DIFFERENCES) :))
    14·2 answers
  • An amusement park offers ride tickets for $1. 50 each to customers who buy the quantities of tickets indicated in the graph belo
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!