Mary buys a cup of instant noodles, a bottle of juice, and a loaf of bread in supermarket at Php (5x + 4), Php (20x − y), Php (3y + 2)
1. Express the total cost in terms of x and y.
2. How much does Mary need to pay if x=2 and y=1?
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Mary buys a cup of instant noodles, a bottle of juice, and a loaf of bread in supermarket at Php (5x + 4), Php (20x − y), Php (3y + 2)
1. Express the total cost in terms of x and y.
2. How much does Mary need to pay if x=2 and y=1?
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Answer:
Mary buys a cup of instant noodles, a bottle of juice, and a loaf of bread in supermarket at Php (5x + 4), Php (20x − y), Php (3y + 2)
1. Express the total cost in terms of x and y.
Php(5x+4)+Php (20x − y)+Php (3y + 2)
= (5x+4)+(20x-y)+(3y+2)
= 5x+4+20x-y+3y+2
= 5x+20x-y+3y+4+2
= Php25x+2y+6
2. How much does Mary need to pay if x=2 and y=1?
Php (5x + 4)
x = 2
y = 1
Substitute;
(5(2)+4)
= 10+4
= Php14
Php (20x − y)
x = 2
y = 1
Substitute;
(20(2)-1)
= 40-1
= Php39
Php (3y + 2)
x = 2
y = 1
Substitute;
(3(1)+2)
= 3+2
= Php5
If the total is needed;
Php(25x+2y+6)
x = 2
y = 1
Substitute;
25(2)+2(1)+6
= 50+2+6
= Php 58