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pashok25 [27]
3 years ago
12

7 pens and 2 pencils cost £22

Mathematics
1 answer:
valina [46]3 years ago
5 0

Answer:

Let pens be x and y be pencils

Let's solve now

7x+2y=22 equation 1

3x+4y=11 equation 2

let's make y the subject of the formular in equatio 1

y=(22-7x)/2

substituting y into the second equation yield

3x+4(22/2-7x/2)=11

Now find x.

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Help please with this question
bogdanovich [222]

Answer:

b. x - 2y = 4

Step-by-step explanation:

The two points on the graph are (0, -2) and (4, 0).

Find slope:

m = (y₂ - y₁) / (x₂ - x₁)

  = (0 - (-2)) / (4 - 0)

  = 2 / 4

  = 1 / 2

Find y intercept using anyone of the points above:

y = mx + b

-2 = 1/2(0) + b

b = -2

Use m and b to make equation of line:

y = mx + b

y = 1/2x - 2

Possible answers:

a. 4x - 2y = 4

         -2y = -4x + 4

             y = 2x - 2

b. x - 2y = 4

       -2y = -x + 4

           y = 1/2x - 2

c. -2x + 4y = -4

            4y = + 2x - 4

              y = 1/2x - 1

Only choice b equals the equation of line above.

4 0
3 years ago
Which equation has the correct sign on the product?
irakobra [83]
C. 25(-5) = 125 this is the answer
6 0
4 years ago
What is 2 times 3? Im just asking a dumb question so u can get points
Kazeer [188]

Answer:

The answer is Six

Step-by-step explanation:

2+2+2 3 times is 6

5 0
4 years ago
7. The cost of 2 notebooks and 4 folders is
KATRIN_1 [288]

Answer: B (The cost of a notebook is $0.75, and the cost of a folder is $0.25.)

Step-by-step explanation:

No need for explanation. i know i’m right!!

5 0
3 years ago
Suppose that Andrea told you that “Blake and I started out with the same number of marbles, but I gave him one of mine. Now Blak
ss7ja [257]
Answer - Andrea is NOT correct.

I can explain it best by suggesting both Andrea and Blake start with 10 marbles.

If Andrea gave one (1) marble to Blake, Andrea now has 9 and Blake has 11.
8 0
1 year ago
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