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cutie777
23.06.2019 •
Mathematics
The bill for five glasses of apple juice and four salads is $9.50, but the total for four glasses of apple juice and five salads is $10.30. what would the be the bill for a glass of juice and a salad?
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Ответ:
we get 5x + 4y = 9.50
4x + 5y = 10.30
Multiplying equation (1) by 5 and (2) by 4
25x + 20y = 47.50
16x + 20y = 41.20
Subtracting we get -
9x = 6.30
x = 6.30/9 = .70
Putting value of x in (1)
5(.70) + 4y = 9.50
3.5 + 4y = 9.50
4y = 9.50 - 3.50 = 6.0
y = 6.00 / 4 = 1.50
Cost of 1 glass of apple juice is $0.70 and of 1 salad is $1.50
Therefore cost of bill for 1 glass of apple juice and 1 salad is .70+1.50 = $2.20
Ответ:
B. (5, -3).
Step-by-step explanation:
This is equivalent to a rotation of 90 degrees clockwise,
This rotation transforms the point (h, k) ---> (k, - h).
So the answer is (3, 5) ---> (5, -3).