Write an equation to represent the
relationship "a number decreased by
11 is equal to -18." then solve the
equation

x-11=-18

x=-7

Check work:

-7 -11 = -18

When both numbers are negative, you add them.

-7 "plus" -11 equals -18.

The equation to represent the  relationship "a number decreased by  11 is equal to -18 is  x - 11 = -18. The value of x is -7

Solution:

From the question:

Given:

A number decreased by 11 is equal to -18.

That would be written as:

To Find the Number:

Assume the variable be X in its place

x - 11 = -18 (1)

Whenever it says "decreased by" a number, you know you are subtracting that number

Therefore from equation (1)

Now, to solve x - 11 = -18  

x - 11 = -18  

x=-18 + 11

x = -7

Hence the value of x is -7  Hence the equation to represent the relationship is x - 11 = -18

middle maybe?

step-by-step explanation:

example answer: "to determine if a sum is reasonable you can round each number to the nearest whole and compare the estimated sum to the actual sum."

hope this you and anyone else who needs the answer : ^)