The answer is the number that 'x' must be in order to make the equation true.
You said that
-4x = 8
Now, watch carefully, as I divide each side of the equation by -4 :
x = -2
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If: 4x+(-12) = 8 then 4x = 20 and x = 5
The derivative of 2x2 + 4x + 8 is 4x+4.
2y = 4x - 16 5y = 4x + 8 Subtract the first equation from the second: 3y = 24 so that y = 8 Substitute this into the first equation: 16 = 4x - 16 ie 32 = 4x so that x = 8 So the solution is (8, 8)
4x + 5y = -8 is an equation with two variables. While you can solve for y = something, you won't come up with a single number. For example, 4x + 5y = -8 5y = -4x - 8 y = -4x/5 - 8/5. And you can do the same for x = something in terms of y.
Presumably this is an equation in which the value of x is to be found. 7x+8 = 4x-10 7x-4x = -10-8 3x = -18 x = -6