Question

Solve y-x-4 = 0 and xy + 2x^2 = -1​

Answer 1

Step-by-step explanation:

−x−4=−y

2

 

Add 44 to both sides.

-x=-y+4−x=−y+4

3

 

Regroup terms.

-x=4-y−x=4−y

4

 

Multiply both sides by -1−1.

x=-4+yx=−4+y

5

 

Regroup terms.

x=y-4x=y−4

1

 

Factor out the common term xx.

x(y+2x)=-1x(y+2x)=−1

2

 

Divide both sides by xx.

y+2x=-\frac{1}{x}y+2x=−x1

3

 

Subtract 2x2x from both sides.

y=-\frac{1}{x}-2xy=−x1−2x