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
solniwko [45]
3 years ago
7

Use the substitution method to determine the solution of the system of equations. y = -5x and 21x - 7y = 28

Mathematics
1 answer:
8_murik_8 [283]3 years ago
3 0

Answer:

x = 1/2   y = -5/2

Step-by-step explanation:

Since we already know an equation for y, we just need to plug it into the other equation.

21x - 7(-5x) = 28

21x + 35x = 28

56x = 28

x = 1/2

Now that we know x, we substitute it into the other equation, to find y.

y = -5x

y = -5(1/2)

= -5/2

You might be interested in
Write (2b^2)^3 without exponents.
Studentka2010 [4]

Answer:

64 * b * b * b * b * b * b

Step-by-step explanation:

Apply exponent to number first, then expand the variable's exponent into repeated multiplication.

4 0
4 years ago
Read 2 more answers
P-value for p = 0.23 is closest to: 0.006 or 0.40?
inn [45]

Answer:

0.40 I'm pretty sure tbh

4 0
3 years ago
A markdown that is less than 1% ?
Sholpan [36]
Then mark it down by less then 1%, of by whatever the number would be. 
5 0
4 years ago
How many 7 digit numbers have6 9 s and no 9 in ones place
Daniel [21]

Answer:

1062882

Step-by-step explanation:

Seven digits numbers, with repetition of digits, having 6 or 9 at the last one's place :

The first six digits can be filled with 9 options each (numbers 1 to 9) , & the last digit can be filled with 2 options (number 6 & 9)

So, total 7 digit numbers as per given condition = 9 x 9 x 9 x 9 x 9 x 9 x 9 x 2 = 1062882

5 0
3 years ago
PLEASE ANWSER CORRECTLY!! I WILL MARK BRAINIEST!!
Pepsi [2]

Answer:

Since angle 1 = angle 3 (vert opp angles),

angle 1 = angle 3 = 180°-129° (adj angles on a str line)

                            = 51°

angle 4 = angle 2 = 129° (vert opp angles)

Hence,

angle 1 = 51°

angle 3 = 51°

angle 4 = 129°

8 0
3 years ago
Other questions:
  • On Tuesday , a local hamburger shop sold a combined total of 423 hamburgers and cheeseburgers . The number of a cheeseburgers so
    14·1 answer
  • Is this table proportional or non-proportional?
    8·1 answer
  • How do I solve these equations?
    15·1 answer
  • Janelle wrote the matrix addition below. Which statement is true?
    12·2 answers
  • BRAINLIEEESSSSTTT!!!
    5·1 answer
  • I NEED HELP QUICK!!!!
    10·1 answer
  • For f(x)=4x+1 and g(x)=(x^2)-5, find (f+g)(x).
    12·1 answer
  • Which list of fractions is in order from smallest to largest? A. 1, 7/10, 3/10, 1/10 B. 3/10, 7/10, 1/10, 1 C. 1/10, 3/10, 7/10,
    10·2 answers
  • U need to find out 3/4 divided by what = 3/24
    13·1 answer
  • Diyva has 70 rocks.she donates half of the rocks to a science center. then she collects 3 rocks on each of her nature hikes
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!