Step-by-step explanation:
when we add the 2 equations
3x + y = 9
-2x - y = -7
-------------------
x + 0 = 2
we see, x = 2. as we solved for x.
then using this e.g. in the first equation
3×2 + y = 9
6 + y = 9
y = 3
so, the first answer is correct.
Complete question :
Sweets are sold loose, or pre-packed in 120g bags.The 120g bags are £1.49 each.The loose sweets are £0.89 for 100g.
By calculating the price per gram, determine which is better value.
Answer:
100 g bag
Step-by-step explanation:
For the 120g bag:
Price per gram :
Price / Numbe of gram
1.49 / 120 = 0.0124 gram per bag
For the 100 g bag :
0.89 / 100
= $0.0089per gram
Since $0.0089 is < $0.0124
Then the 100g bag is of better value
Answer:
If the attached graph is the one you mean, the answer is g(x) = (x-4)^2 + 1
There are 1,16,280 different recital programs possible.
Given: A pianist plans to play 4 pieces at a recital from her repertoire of 20 pieces and is carefully considering which song to play first, second, etc.
It means the repetition of pieces is not allowed.
When repetition is not allowed, then the number of ways to arrange n things where r things taken together is given by:-
Now, the number of different recital programs are:-
Hence, there are 1,16,280 different recital programs possible.
Learn more about probability here brainly.com/question/251701
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Answer:
10 three point questions, 14 five point questions
Step-by-step explanation:
trial and error