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Q: Is y equals -4x plus 3 linear?

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Yes, it is a linear straight line equation.

It works out that x = 0 and y = 3

x = 3, y = 3

Two solutions and they are:- x = 0 and y = 3

You cannot solve one linear equation with two variables.

It's a simple linear equation in 'x'. It's not true unless x = 3 .

y = 4x-3

x=3

= 3

3+6x = 4x+9 6x-4x = 9-3 2x = 6 x = 3

5x - 4x = 13 - 3 ie x = 10

5+4x-7 = 4x+3-x 4x-2 = 3x+3 4x-3x = 3+2 x = 5

It's an equation. Specifically, a linear equation in ' x '.Here's the solution for ' x ':4x + 7 = -3 - x5x + 7 = -35x = -10x = -2

If 4x + 7 = 3... then x must equal -1

33

7

x=3

-4x+3 = 23+6x -4x-6x = 23-3 -10x = 20 x = -2

4x+9 = 7x+3 4x-7x = 3-9 -3x = -6 x = 2

2x = 4x + 3 -2x = 3 x = -3 / 2

If 4x + 3 = 9, then 4x must equal 6. Therefore x=1.5

x^2+4x+7

y=-x^2+4x-3

subtracting gives 4x = -12 so x = -3

x = 3