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
Tom [10]
3 years ago
13

A+b=77,a-b=13 care sun nr

Mathematics
1 answer:
STALIN [3.7K]3 years ago
3 0
It's a simultaneous equation:
Steps:
1.Number the equations..

a+b=77 -1
a-b=13 -2

2. Choose what variable you want to use. In this case I would use the "b". Since the signs in front of the "b's" are different, add the two equations together

a + b = 77
+ + +
a (-b) = 13

Which gives;
2a = 90

Then solve to find a:
2a=90
a= 90/2
a=45

3.Then plug the "a" value into any of the original equations to find the "b" value. I would use equation 1 since the all the variables are positive.

a + b = 77
(45) + b = 77
b=77-45
b=32

4.Solution

a=45
b=32
You might be interested in
Function k is a linear function with a slope of 1/2 that passes through the point (4,2). What equation represents Function K?
Novay_Z [31]

Answer:

A. y = 1/2 x.

Step-by-step explanation:

Use the point-slope form of a linear (straight line) function:

y - y1 = m(x - x1)

m = 1/2, x1 = 4 and y1 = 2, so:

y - 2 = 1/2(x - 4)

y = 1/2x - 2 + 2

y = 1/2 x (answer)

8 0
3 years ago
Crystal solved the following equation incorrectly. In which step did she make a mistake? A Step 1 B Step 2 C Step 3 D Step 4
dem82 [27]

Answer: i don't know

Step-by-step explanation:yep

6 0
3 years ago
I need help right now!!!ASAP
katovenus [111]

Answer:

Points Q, J and M are not collinear

Step-by-step explanation:

Three points cannot be collinear if they are not coplanar (on the same plane), and M is on a different plane than Q. J is located on both planes.

7 0
2 years ago
One equation in a system of equations is y = 3/4x - 1. For which second equation would the system have exactly one solution? cho
Zina [86]

Answer:

ace

Step-by-step explanation:

5 0
2 years ago
Gabriel works at an amusement park. He loads 15 new passengers onto the roller coaster every 5/6 of a minute. At what rate does
dem82 [27]

Answer:

12 1/2 or 12.5

Step-by-step explanation:

all you have to do is multiply 15 times 5/6

4 0
3 years ago
Other questions:
  • Solve the equation 6t-1/6=9
    14·2 answers
  • What is 18.345-10.67 and who ever helps me I will help them
    14·2 answers
  • WILL GIVE BRAINLIEST<br><br> Match the equations of the lines with their graphs
    5·2 answers
  • A square has a length of 0.75m. Find the area.
    10·1 answer
  • Find the quotient:<br><img src="https://tex.z-dn.net/?f=24.0552%20%5Cdiv%2012" id="TexFormula1" title="24.0552 \div 12" alt="24.
    5·1 answer
  • Deshaun exercises no less than 40 minutes per day.
    10·1 answer
  • The Apple Store in Honolulu sells 6,300 iPhones during a 5 hour time period. How many iPhones is The Apple Store selling in 1 mi
    6·2 answers
  • The water level in Rocky's lake changes on an average of -7/16 every 3 years. Based on the rate of the level, how much will the
    12·1 answer
  • What is the chance you'll roll this FNC (fair # cube) and it will land on a number less than 5?
    6·1 answer
  • (2×/×+3)- (×/×-3)=(3÷3-×)​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!