18. Simplify the expression
x-y
___
y-x

a. - 1
b. 1
c. x-y
__
y-x
d. x+y
__
y-c


Sagot :

Answer:

Simplify (x-y)/(y-x)

x

y

y

x

Factor

1

out of

x

.

1

(

x

)

y

y

x

Factor

1

out of

y

.

1

(

x

)

(

y

)

y

x

Factor

1

out of

1

(

x

)

(

y

)

.

1

(

x

+

y

)

y

x

Reorder terms.

1

(

x

+

y

)

x

+

y

Cancel the common factor.

1

(

x

+

y

)

x

+

y

Divide

1

by

1

.

1