15) Which equation does not represent a function?

1 answer:

4 0

The answer is D as it can be rewritten as -((y^2)/5)-(8/5)=x. Solving for the x-intercepts you get -((y^2)/5)-(8/5) = 0 as you want to find the y values when x is zero. Solving for y you get: (y^2)/5)+(8/5) = 0 => (y^2)/5)=-(8/5) => y^2=-8 => y = plus or minus sqrt(-8). The first problem is that you have 2 x intercepts which already makes it not a function and second sqrt(-8) is an imaginary number making the solution not a real number.

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Luda [366]

Hello, that number before the parenthesis means we have to multiply the number outside the parenthesis for the one inside it.

So, the first one 9(1/3) it's easy. We can write 9 as 9/1 to semplify our work.

You have to cross multiply. When cross multiplying, you can simplify numbers. 9 and 3 can be both divided for 3.

You get 3/1 × 1/1 = 3

It equals to 3

Then, 4(2.6) = 4 × 2.6 = 10.4

2(-3) = +2 × (-3) = -6

When you multiply a positive number for a negative one, you'll always get a negative number.

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3 - 10.4 - 6 = 3 - 10.4 - 6 = - 13,4

Final answer: -13,4

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