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
AURORKA [14]
3 years ago
15

2a + b = 3 and a - 3b = 5

Mathematics
1 answer:
vfiekz [6]3 years ago
6 0

Answer:

a= 2 b=-1

Step-by-step explanation:

a-3b=5

or, a= 5+3b_(i)

substituting value of a in 2a+b=3,

2×(5+3b)+b=3

or, 10+6b+b=3

or, 7b=3-10

or, 7b=-7

b= -1

substituting value of b in(i),

a=5+3b

=5+3×(-1)

=5-3

=2

You might be interested in
Difference
Ivan

Answer:

The value of a function is the actual calculation done at a certain point. The limit is - roughly speaking - the value at points that are “arbitrarily close” to the same point. For most commonly used functions, the value of a function at a point, and the limit at the same point, is the same - at least for most values.

4 0
3 years ago
A value 5 times a smaller number is 1 less than a larger number. their difference is 73
salantis [7]

Answer:

The numbers are 18 and 91

Step-by-step explanation:

You can translate the information to two equations:

<em>a value 5 times a smaller number is 1 less than a larger number</em>

5a = b - 1

<em>their difference is 73</em>

b - a = 73

Then you should merge one equation into the other, thereby eliminating one variable. You can do this any way you want. I choose to rewrite the first equation as:

b = 5a + 1

Now I can write 5a+1 in the second equation at the place where b was:

5a + 1 - a = 73

It is now an equation with only one variable, solve by simplifying

4a = 72

a = 18

Now b can be found using b = 5a + 1

b = 91

8 0
4 years ago
Find all the real zeros of the function y = -6x - 5<br> A -5/6 B 5/6 C -6 D -6, -5
Gekata [30.6K]

Answer:

A) -5 / 6

Step-by-step explanation:

4 0
3 years ago
The average height of 4 children is (15h-3). Two more children join the group with heights of (10h+46) centimeters and (14h-16)
oksian1 [2.3K]

Answer: 123.5 centimeters


Step-by-step explanation:

Let sum of observations be S and number of observations be n.

Average A=\frac{\text{S}}{\text{n}}

The average height of 4 children is (15h-3)

(15h-3)=\frac{S}{4}\\\Rightarrow\ S=4(15h-3)\\\Rightarrow\ S=60h-45

Also, when two more children join the group with heights of (10h+46) centimeters and (14h-16) centimeters the sum of heights of 6 children will be

S+(10h+46)+(14h-16)=60h-45+10h+46+14h-16=84h-107

Now, Average height of 6 students=\frac{84h-15}{6}

At h=9

Average height of 6 students=\frac{84(9)-15}{6}=\frac{741}{6}=123.5\ centimeters



3 0
4 years ago
A) Write the exponential equation to represent a house purchased for
dsp73

Answer:

= A(t) = 120000(1.06)^t   t = 1 year

We just add ^12 to equal 1/12 months.

Then use the notation below.

Step-by-step explanation:

We simply want to write an equivalent form of the same equation that will allow for the time period to be calculated in years.

For one year, t = 1, we want it to grow 6% = 1.06

Yearly Rate of Growth annual equation: = 7200

P(i) 7200/ 120000 x 100% = 6% per year growth rate

the yearly growth factor is 1 + appreciation rate = 1+i =1+0.06= 1.06

So time in years can be added to t

= A(t) = 120000(1.06)^t   t = 1 year

The yearly growth factor = 1.06

To equate monthly we add the exponent  t*12*1/12 before  120000(1.06)^t

then add 1/12 to replace ^t = monthly, or just keep the t= time

A(t) = 120000(1.06)^12t

4 0
3 years ago
Other questions:
  • I need help ,,, and tahnks☺
    10·2 answers
  • What is the direct variation equation if y varies directly with x and y = –18 when x = 3?
    10·1 answer
  • Solve for the angle B tan 2B = cot 2B
    7·1 answer
  • Which expression shows the perimeter of the triangle in simplest form?
    12·1 answer
  • A sales firm receives an average of three calls per hour on its toll-free number. For any given hour, find the probability that
    11·1 answer
  • Find values for a and b so that 2(3x+5)+ax=5(4x−b) is an identity equation.
    11·1 answer
  • can someone please help me on numbers 5-10 and please show and explain your work HELP THIS IS DUE SOON thxs uwu
    11·1 answer
  • Pov : ALL I DO IS SPAM STUFF AND YOU LIKE ME (BETTER ONLY SAY POINTS FOR THIS 100)
    6·2 answers
  • |-4w+2|=14<br> the bars mean absolute value
    8·2 answers
  • Enter a formula using k to connect the two variables. y is proportional to 1/x
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!