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
adell [148]
3 years ago
13

How do I solve this equation

Mathematics
1 answer:
Anestetic [448]3 years ago
4 0
-x - y = 8
2x - y = -1

Ok, we are going to solve this in 2 parts.  First we have to solve for one of the variables in one of the equation in terms of the other variable.  I like to take the easiest equation first and try to avoid fractions, so let's use the first equation and solve for x.

-x - y = 8      add y to each side
-x = 8 + y      divide by -1
x = -8 - y

So now we have a value for x in terms of y that we can use to substitute into the other equation.  In the other equation we are going to put -8 - y in place of the x.

2x - y = -1
2(-8 - y) - y = -1      multiply the 2 through the parentheses
-16 - 2y - y = -1      combine like terms
-16 - 3y = -1            add 16 to both sides
-3y = 15                   divide each side by -3
y = -5

Now we have a value for y.  We need to plug it into either of the original equations then solve for x.  I usually choose the most simple equation.

-x - y = 8
-x - (-5) = 8            multiply -1 through the parentheses
-x + 5 = 8                subtract 5 from each side
-x = 3                      divide each side by -1
x = -3

So our solution set is

(-3, -5)

That is the point on the grid where the 2 equations are equal, so that is the place where they intersect.

You might be interested in
URGENT!!!!!
Anna11 [10]

h=20w

in one week hector works 20 hours

in two hector works 40 etc


h = hours and w = weeks. the money is just extra information.

h=20w works because if it has been two weeks we substitute the w with the number 2 and can solve

h=20(2)

h=20x2

h=40

This proves that the equation is true

7 0
3 years ago
Slope: -5, y-intercept:3
Sati [7]
Whats the question?
6 0
3 years ago
Read 2 more answers
Angela's car payment is due January 31. This bill is always paid automatically from her checking account. It is January 30 and A
hram777 [196]
<span>Calling the company that holds the car loan and asking them about other repayment options is the best tactic. This allows the loan holder to negotiate terms that would be acceptable to both sides, as well as showing that Angela is trying to make a good-faith effort to repay what she can. While it may increase the overall length of time that her payments require, it also shows that she is not going to outright default on the payments.</span>
7 0
4 years ago
Read 2 more answers
Write as a mathematical equation. The product of 5 and x is 25.
pickupchik [31]

answer:

5x=25

Divide 5 from both sides

5x/5=25/5

x=5

4 0
3 years ago
THIS IS THE THIRD AND FINAL TIME I WILL EVER POST A QUESTION ON BRAINLY IF SOMEONE GIVES ME A INCOMPLETE QUESTION (AKA TROLL COM
Afina-wow [57]

B and C are correct because you do basic PEMDAS and get 58 for both those expressions. If this is right could you possibly give me brainliest? Hope this helped.

8 0
3 years ago
Other questions:
  • Someone please help??
    13·1 answer
  • 2 (k + 2) = 8k - 5 - 3k
    9·2 answers
  • Formula to get the energy of an object
    14·2 answers
  • Jasmine is traveling at 45 miles per hour. At that same rate, how long will it take her to travel 135 miles?
    9·2 answers
  • The formula h-15=3.2t gives the height h in inches of a plant t weeks after planting. Which is the rate at which the plant heigh
    8·1 answer
  • L(x) = 2(2x + 1)3(2 – 2x)3<br><br> Leading term!!
    7·1 answer
  • Please help with a Step by step!!! <br>Will mark Brainliest
    8·1 answer
  • Will give Brainliest If Correct! Pls don’t copy answers
    5·1 answer
  • Please help me solve this question, I don’t get it at all
    10·1 answer
  • WILL GIVE BRAINLIEST!!
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!