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Daniel [21]
4 years ago
9

If x/y = -3, then find x²/y² + y²/x² ​

Mathematics
1 answer:
tatuchka [14]4 years ago
4 0

Answer:

x/y= −3 => x= −3y

x²/y²+y²/x²=y²/x²

Step-by-step explanation:

Evaluate xy, then set it equal to −3.

x=−3y

Evaluate x²/y²+y²/x².

y²/x²

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If Aisha buys 2 veggie wraps and 3 apples and spends 6.24, and Jamie buys 3 veggie wraps and 2 apples and spends 6.64. How much
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Answer:

1.488

Step-by-step explanation:

Let x be the price of a veggie wrap and y be the price of an apple.

2x + 3y = 6.24 [EQUATION 1]

3x + 2y = 6.64 [EQUATION 2]

[You need 2 equations for this question because there are 2 unknowns, the prices of a veggie wrap and an apple.]

[You can use elimination or substitution to calculate the equations. I'll just use elimination]


ELIMINATION:

[EQUATION 1 * 3] - [EQUATION 2 * 2]:


(2x + 3y)*3 - (3x + 2y)*2 = (6.24*3) - (6.64*2)

6x + 9y - 6x - 4y = 18.72 - 13.28

5y = 5.44

y = 1.088

[since y is the price of an apple and NOT a veggie wrap, you still need to find x]


sub (substitute) y = 1.088 into [EQUATION 1]

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An apple costs 1.088 and a veggie wrap costs 1.488.

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