What is the value of x in the equation -x - y = 30, when y = 15?
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x = -45.

Step-by-step explanation:

-x - y = 30

-x - 15 = 30

x + 15 = -30

x = -45

To check we are correct...

-(-45) - y = 30

45 - y = 30

-45 + y = -30

y = 15

So, x = -45.

Hope this helps!

x = -45

Step-by-step explanation:

-x - y = 30

Let y = 15

-x - 15 = 30

Add 15 to each side

-x-15+15 = 30+15

-x = 45

Multiply each side by -1

x = -45