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
dedylja [7]
3 years ago
11

-7x - 8y = 9 4x -9y = 22

Mathematics
1 answer:
umka21 [38]3 years ago
8 0

Answer:

x=1 and y=−2

Step-by-step explanation:

Multiply the first equation by 9,and multiply the second equation by -8.

9(−7x−8y=9)

−8(4x−9y=22)

Becomes:

−63x−72y=81

−32x+72y=−176

Add these equations to eliminate y:

−95x=−95

Then solve−95x=−95for x:

−95x

−95

=

−95

−95

(Divide both sides by -95)

x=1

Now that we've found x let's plug it back in to solve for y.

Write down an original equation:

−7x−8y=9

Substitute1forxin−7x−8y=9:

(−7)(1)−8y=9

−8y−7=9(Simplify both sides of the equation)

−8y−7+7=9+7(Add 7 to both sides)

−8y=16

−8y

−8

=

16

−8

(Divide both sides by -8)

y=−2

You might be interested in
Show that point (pi/3,1/2) is on the curve of y=cosx
jarptica [38.1K]
Here y=1/2 x=pi/3=60°

y=cosx
1/2=cos60° and cos60°=1/2
so LHS=RHS

so that point is on curve y=cosx
6 0
3 years ago
What is 2x+5=y and 5x+4=y pls hurry
Sergeu [11.5K]

Answer:

( 1/3, 5 2/3) Or (0.33, 5.66)

Step-by-step explanation:

If you graph the 2 equations and see where they intersect, they will land on the answer.

4 0
3 years ago
How many solutions does -9(x+6)=-9x+108
trapecia [35]

Answer:

You can put this solution on YOUR website! ... equation 2: -10x + 6y = -108 ... to change both to positive 10x = 60 divide both sides by 10 10x/10 = 60/10 x = 6 .

Step-by-step explanation:

8 0
3 years ago
John can write 35 words per minute write an expression for the number of minutes it takes John to type x words
lukranit [14]
It is y(1/x) minutes

6 0
3 years ago
Solve the two-step equation. 5.1 = –3x – 4.2 1. Add 4.2 to both sides. 2. Divide both sides by -3. The solution is x = _________
Serggg [28]

Answer:

5.1 = -3x - 4.2

-3x - 4.2 = 5.1

-3x = 5.1 + 4.2

-3x = 9.3

x = 9.3/-3

x = -3.1

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is 7/9 as a decimal terminating or repeating decimal
    9·1 answer
  • Match each object with the characteristics it represent
    15·1 answer
  • 10a−25+5b= <br> I NEED HELP PLZ
    11·1 answer
  • 2x+5x=100 x intercept​
    12·1 answer
  • Find the area of the parallelogram.
    13·2 answers
  • A factory made 69 packs of mint-flavored gum and 31 packs of fruit-flavored gum. What percentage of the packs contained mint gum
    8·1 answer
  • What is the value of the x in the given diagram?​
    8·1 answer
  • NEED ASAP BEFORE MARCH 11 2021
    14·1 answer
  • Pls help! Solve for p) (p+3)/m = -1
    9·2 answers
  • The ratio 7:5 is eqvivalent to 28
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!