Solve the equation 3 x+5 y=16 for y
1 answer:
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The correct option is D. I mean the last option
The equation of the vertical line is
x=-3
So its inequality is
x<-3
The solid line passes through
(0,-1), (-1,0)
So its inequality is
y≤-x-1
Testing (-4,0) for
We shade to the left.
Testing the origin for
yields
This is false so we shade the left half plane of the solid line. The intersection of the two region is the region in option D
The equation of the vertical line is
x=-3
So its inequality is
x<-3
The solid line passes through
(0,-1), (-1,0)
So its inequality is
y≤-x-1
Testing (-4,0) for
We shade to the left.
Testing the origin for
yields
This is false so we shade the left half plane of the solid line. The intersection of the two region is the region in option D
Answer:
20 mangoes.
Step-by-step explanation:
Given:
Total number of mangoes, a trader bought =
A trader bought at the rate of 4 mangoes for 10 naira.
Five of the mangoes were bad.
He sold the remaining at the rate of 5 mangoes for 20 naira.
He made a gain of 10 naira
Question asked:
Total number of mangoes, a trader bought = = ?
Solution:
Unitary method
Cost price of 4 mangoes = 10 naira.
Cost price of 1 mango =
Cost price of mango =
As 5 of the mangoes were bad and he sold the remaining mangoes, then Total number of mangoes sold =
Sale price of 5 mangoes = 20 naira
Sale price of 1 mango =
Sale price of mango =
Now, as we know,
Adding both sides by 20
Multiplying both sides by 2
Dividing both sides by 3
Therefore, total number of mangoes, a trader bought is 20.