This is a simultaneous equation question:
x-2y = -4
2x-y = 1
Multiply all terms in the top equation by 2:
2x-4y = -8
2x-y = 1
Subtract the bottom equation from the top equation remembering that a minus minus equals a plus:
-3y = -9
Divide both sides of the equation by -3 to find the value of y remembering that a minus divided by a minus equals a plus:
y = 3
Substitute the value of y into the original equations to find the value of x:
Solution: x = 2 and y = 3
i don't get that if it is 2xy +8 or 8 + 2xy then you can't solve or simplify it any further if it were 8 x 2y then you time the 8 by the 2 to get 16y
(2x)ysquared
Whooop!
4xy + x3y + yx2 + yx + 3yx = x3y + x2y + 8xy = (xy)(x2y + x + 8)
3x3 - x2y + 12x - 4y = x2*(3x - y) + 4*(3x - y) = (x2 + 4)*(3x - y)
8-x2y 8-2xy 2xy-8
i don't get that if it is 2xy +8 or 8 + 2xy then you can't solve or simplify it any further if it were 8 x 2y then you time the 8 by the 2 to get 16y
(2x)ysquared
Whooop!
The GCF of 27 x^2 y^3 and 46 x^2 y is xy^2. 27 and 46 are coprime.
It is -2y + x2y - 8, which is an expression that cannot be simplified further, not can it be evaluated.
You will get nonsense. You cannot plug x2y + 4 into anything!
4 (apples) plus 3 (apples) = 7 (apples). 4 (cows) + 3 (cows) = 7 (cows) 4 (x2y) + 3 (x2y) = 7 (x2y)
Do the multiplication, then take the square root. After the multiplication, you get 28x4y2. The square root of 28 is 2 times the root of 7, the square root of x4 is x2, and the root of y2 is y. So, the final result is 2 times square root of 7, times x2y.
x2y = k (constant) so 36 x 2 ie 72 is the constant. If x = 3 then y = 72/9 = 8
xy
The GCF is xy