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Q: What are the values of x and y when x minus y equals 0 and x squared plus y squared equals 18?

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2

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That depends what the values of k and b are.

The centre is (-5, 3)

You have to put your heart into it!

7(3y-2)-(-4y+9)

x = plus or minus 6.

X=1

7

Draw the graph of negative X squared plus 5 minus X cubed and find the values of x where it intersects the x axis.

X=-3

x = -28 / -11^2

{-1,7}

They touch each other at (0, 100) on the x and y axis.

x equals negative b plus or minus the square root of b squared minus 4bc over 2a

It also equals 13 12.

They are identities because they are true for ALL values of w and x.

Four squared plus 188,898 minus 17,798 plus 188,898 = 360,014

1/2 = 25/50

x = 25 / 3squared + 5

The discriminant b2-4ac is -23

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-22 - -22

-2, 1.74 and 0.46