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
djyliett [7]
3 years ago
12

4-5a+b=87a +9b = -32I need to use substitution for this one. Help?​

Mathematics
1 answer:
Sauron [17]3 years ago
8 0

Answer:

<h2>a = -2, b = -2 </h2>

Step-by-step explanation:

\left\{\begin{array}{ccc}-5a+b=8&\text{add}\ 5a\ \text{to both sides}\\7a+9b=-32\end{array}\right\\\\\left\{\begin{array}{ccc}b=5a+8&(1)\\7a+9b=-32&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\\\7a+9(5a+8)=-32\qquad\text{use the distributive property}\\\\7a+(9)(5a)+(9)(8)=-32\\\\7a+45a+72=-32\qquad\text{subtract 72 from both sides}\\\\52a=-104\qquad\text{divide both sides by 52}\\\\\boxed{a=-2}\\\\\text{Put the value of}\ a\ \text{to (1):}\\\\b=5(-2)+8\\\\b=-10+8\\\\\boxed{b=-2}

You might be interested in
Help would be appreciated ( Grade 4 homework )
saul85 [17]

9514 1404 393

Answer:

 (B)  4

Step-by-step explanation:

Consider the units column. The only sum of 3 and a single digit that will end in 1 is the sum ...

  3 + 8 = 11

This tells you A = 8, so the top number is 1983, and the middle number is B78.

Considering the first two columns, we know that 83 +78 = 161, so there must be a carry of 1 into the third column. That makes it have the sum ...

  1 + 9 + B = <something ending in 4>

We know the something cannot be 04 or 24, so must be 14. Then ...

  10 + B = 14   ⇒   B = 4

__

So, the whole sum is ...

  1983 +478 = 2461

and the letter values are ...

  • A = 8
  • B = 4
  • D = 2
3 0
3 years ago
Read 2 more answers
What are the coordinates of the image produced by applying the composition / to the point (–5, 4)?
Rainbow [258]
Its D(5,-4) XD ;p
because I did it and got it right but don't take my word for it just ask the other suggestions <span />
3 0
3 years ago
3(x – 5) = 2(x – 5) + x solve for x and number of soultions
ArbitrLikvidat [17]

Answer:

Step-by-step explanation

3x-15=2x-10+x

3x-15=3x-10

in this step, problem happens

becoz both side doesnt equal, no ans can be proven

4 0
3 years ago
Read 2 more answers
Based on the table, which function models this situation?
alexdok [17]

Answer:

F(n) =-3n+24

Step-by-step explanation:

3 0
3 years ago
Cost of Toy Cars A graph with cars on the x-axis and cost on the y-axis. A line goes through points (0, 0), (2, 3), (4, 6). What
MaRussiya [10]

Answer:

D 27

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • Last night, 80 people attended a lecture at the Smithville Public library. 47 of the attendees were men. What ratio BEST represe
    8·2 answers
  • How do you do monomial
    6·1 answer
  • Explain the importance of factoring.
    9·1 answer
  • What happens to the slope when a line with positive slope gets close to vertical
    14·1 answer
  • Which of the following are trinomials ​
    12·1 answer
  • Find f(x) and g(x) so the function can be expressed as y = f(g(x)). y = Two divided by x squared. + 3
    15·1 answer
  • You are graphing Rectangle ABCD in the coordinate plane. The following are three of the vertices of the
    11·1 answer
  • The graph above is a linear equation that includes the points (-3,-2) and (-1,2). Find the slope of the line. Explain how you ar
    6·1 answer
  • 4 + t + 5 = 3 − √ t + 5 4 + t + 5 = 3 - t + 5
    5·1 answer
  • What make the following inequality true?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!