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
e-lub [12.9K]
4 years ago
6

Solve the equations by elimination. -7x-8y=9 -4x+9y=-22

Mathematics
1 answer:
Sergeeva-Olga [200]4 years ago
4 0

Solve for x in -7x - 8y = 9

x = -9 + 8y/7

Substitute x = -9 + 8y/7 into -4x + 9y = -22

4(9 + 8y)/7 + 9y = -22

Solve for y in 4(9 + 8y)/7 + 9y = -22

y = -2

Substitute y = -2 into x = -9 + 8y/7

x = 1

Thus,

<u>x = 1</u>

<u>y = -2</u>

You might be interested in
P,W,R &amp; S form the vertices of a quadrilateral. PQR = 74 degrees
Zielflug [23.3K]

Answer:

∠ SPQ = 75°

Step-by-step explanation:

The sum of the 4 angles in a quadrilateral = 360°

Subtract the sum of the 3 angles from 360 for ∠ SPQ

∠ SPQ = 360° - (90 + 74 + 121)° = 360° - 285° = 75°

6 0
3 years ago
Read 2 more answers
What are the solutions to the quadratic equ ton x2 – 16 = 0?
swat32

Answer:

x=4 and x=-4

Step-by-step explanation:

you dont really have to solve this one when you multiply the answer choices they should equal your B which is -16 and only 4 • -4 = -16 so yeah thats your answer

8 0
4 years ago
Which expression is equivalent to 4 -(-7)? A 7+4, B 4-7, C -7-4, D -4+7
My name is Ann [436]
Hi there! You are subtracting a negative number, which is basically the same thing as adding, because two negatives make a positive. B and C is out, because they do not fit the expression. You are actually adding both numbers and anytime you have to subtract a negative number, you add. When you do basic math, 4 + 7 is 11. Both numbers are negative and D does not work, because you're adding from a negative number. The only answer choice that has the expression is A. The answer is A.
8 0
4 years ago
Solve the equation<br> 80 = 2m<br> A) 4<br> B) 40<br> C) 160<br> D) 320
Masja [62]

Answer:

B)40

Step-by-step explanation:

80 = 2 times 40: 80 = 80

8 0
3 years ago
Find the volume of a cone with a diameter of 15 mm and a height of 6 mm
timurjin [86]
First cut the diameter in half 15/2
Your radius is now 7.5, always cut your diameter in half to find the radius

4 0
4 years ago
Other questions:
  • A quadrilateral with vertices at A(4, –4), B(4, –16), C(12, –16), and D(12, –4) has been dilated with a center at the origin. Th
    5·2 answers
  • A company has developed a wristband for monitoring blood sugar levels without requiring direct blood samples. It is interested i
    9·1 answer
  • Which of the following is the graph of f(x) = x2?
    12·2 answers
  • Jesse has a container that contains 18 3/4 cups of ice cream. How many 1/3 cup servings are in the container?
    6·2 answers
  • johnny has 24 soap bottles he shares half of all the soap bottles with his friends how many soap bottles does johnny have left
    6·2 answers
  • Factor out the GCF for 21x^3y^2 - 7x^2y + 42xy
    9·1 answer
  • PLEASE HELP ASAP (20 points) Basic Inverse Function Question<br> *see attachment*
    9·1 answer
  • Solve for x and graph ​
    9·2 answers
  • Convert the percent to a decimal<br> 24 1/2%
    5·1 answer
  • Solve for y: 3y + 5 - 8y = 2y - 7 - 4y<br> A y = - 4<br> B y = 12/7<br> C y = 4<br> D y = 2/3
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!