Q: What is -21x equals -126?

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21x + 9 = 180 21x = 180 - 9 21x = 171 x = 171/21 x = 8.143

If: 9x = 21x-3 Then: x = 1/4 or 0.25

x2 - 21x = 72x2 - 21x - 72 = 0(x - 24) (x + 3) = 0x = 24x = -3

20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19

The equation "9n equals 126" can be written as 9n = 126.

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21x + 9 = 180 21x = 180 - 9 21x = 171 x = 171/21 x = 8.143

If: 9x = 21x-3 Then: x = 1/4 or 0.25

21x+452 = 32-84x 21x+84x = 32-452 105x = -420 x = -4

x2 - 21x = 72x2 - 21x - 72 = 0(x - 24) (x + 3) = 0x = 24x = -3

234 it is not the answer

Make it equal zero by subtracting 21x from both sides. 20x2 - 21x - 5 factors to (4x - 5)(5x + 1)

x2 - 21x = 72x2 - 21x - 72 = 0(x - 24) (x + 3) = 0x = 24x = -3

20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19

The equation "9n equals 126" can be written as 9n = 126.

21x + 12x -2 = 0 33x -2 = 0 33x = 2 x = 2/33 x = 0.06

Multiplying the first equation by -3 gives -21x - 6y = -48 but the other equation gives 24 as the value of the same expression, so you are correct, there is no solution

put both equations in standard form y - 3x = -5 (equation 1) -7y + 21x = 35 (equation 2) multiply equation 1 by 7 (this is done so either one of your variables will cancel... if both variables cancel then these lines are parallel) 7y - 21x = -35 -7y + 21x = 35 0 = 0 therefore your lines are parallel