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vovikov84 [41]
3 years ago
13

Number 16. Use substitution. Show how you did it pls. Im bouta cry

Mathematics
1 answer:
Rufina [12.5K]3 years ago
4 0
1-3x-y=3
2x+y=25
Let’s start with the first one.
Subtract 1 from each side
-3x-y=2
Then add -3x to each side
-y=3x+2
Then move the negative and change the signs
Y=-3x-2
Now plug into the second equation
2x+(-3x-2)= 25
Now solve for x
2x-3x-2=25
Add 2 to both sides
2x-3x=27
Now subtract
-x=27
Move the negative to the other side because x can not be negative
X=-27
Now plug that into the second equation
2(-27)+y=25
Now just solve
-54+y=25
Y=79
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The student added the discount instead of subtracting the discount.

They also did not calculate the tax correctly.

Step-by-step explanation:

Original price is 499

Discount = original price * percent off

Discount = 499 * .18

               =89.82

The sale price = original price minus the discount

sale price = 499-89.82

sale price = 409.18

Sales tax = sale price * tax rate

                = 409.18 * 8.875%

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Rounding to the nearest cent

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The student added the discount instead of subtracting the discount.

They also did not calculate the tax correctly.

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