Solve y=4x-1; y=3x+6 by substitution

   [2]    y = 3x + 6

   [1]    (3x+6) - 4x = -1

  [1]     - x = -7

    [1]    x = 7  

     y = 3x+6

    x= 7

    y = 3(7)+6 = 27  

  {y,x} = {27,7}  

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x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

in the math equation 8 x 7 = 56, the 8 and the 7 are both factors of 56, since in this lesson we will use square tiles to figure out the factors of a whole find as many different arrays as you can, but follow one important rule: all the rows must have the i can make two rows of nine, so 2 and 9 are both factors of 18.

step-by-step explanation: