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Stella [2.4K]
4 years ago
12

A.(7,8) B.(2,22) C.(2,8) D.(3,29)

Mathematics
1 answer:
11Alexandr11 [23.1K]4 years ago
6 0
To solve this system using the subst. method, equate y = 7x + 8 to y = x + 20.

Then 6x = 12, and x = 2.  To find y, subst. 2 for x in either of the given equations.  

Write your solution as (2, y).
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One day, a café sells 3 more than twice the number of cappuccinos as they do lattes. They sold a total of 33 cappuccinos and lat
Assoli18 [71]

Answer:

x +(2x + 3) = 33

Step-by-step explanation:

two equations can be derived from the question

c = 3 + 2x equation 1

c + x = 33 equation 2

where :

c =  cappuccinos

x =  lattes

make c the subject of the formula in equation 2

c = 33 - x equation 3

equate 3 and 1

x +(2x + 3) = 33

3 0
3 years ago
A3 Math gr6 20-21 Form O Online 21 of 34Item s Ali writes the expression "half of the sum of $9$ and a number." Write an algebra
svlad2 [7]

Answer: See explanation

Step-by-step explanation:

We are informed that we should write a equation that represents the expression "Ali writes the expression "half of the sum of $9 and a number.".

Let the number be represented by x. The first equation based on the information given will be:

= 1/2(9 + x)

The second equation will be:

= (9 + x)/2

= 4.5 + 0.5x

4 0
3 years ago
4. Escribe<br> 5. Escribe la ecuación 3x + 4y - 20 = 0 en su forma simétrica.<br> 62
navik [9.2K]

Answer:

which principle prevents a brach from abusing  its power

Step-by-step explanation:

7 0
4 years ago
If p=28 what does 5p squared - 5p equal?
Oduvanchick [21]

Answer:

19460

Step-by-step explanation:

5 times 28= 140

140 squared =( 140 times 140)=19600

19600 - 5 times 28

19600 - 140= 19460

3 0
3 years ago
4. When Megan solved this system using the elimination method, she added the equations together and got the equation 4y = 16. Th
Ede4ka [16]
Hi there!

So, our two equations are:
2x + 3y = 20 and
-2x + y = 4

We can see that the x's will cancel out because they're the same number, opposite signs. Then we're left with 4y = 24.

Divide 24 by 4, which is 6.

y = 6, then we plug that in to the first equation for y:
2x + 3(6) = 20
2x + 18 = 20
2x = 2
x = 1

So, she made her first mistake when adding the equations, adding 20 and 4, she somehow got 16. 

The solution to the system is (1,6).

I hope I helped!
6 0
3 years ago
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