3 years ago

Choose the equation below whose axis of symmetry is x = 2.

1 answer:

3 0

The answer is y = x2 − 4
if you try to factor out all of the equations given to you (ex. 0=x2+4x+2), the only equation that can be factored out is y = x2 − 4.

y = x2 − 4
0= x2 − 4
0=(x-2)(x+2)
0=x-2 0=x+2
2=x x=-2

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Mr. Anders was three times as old as Kate 5 years ago. Their total age now is 42 years. How old is Kate now?

katrin [286]

We can write this as two equations. Call Mr. Anders' age A and Kate's age K:
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Then solve for A in the second equation:
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Substitute this into the first equation:
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2 years ago

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nevsk [136]

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