Question

The sum of two integares 18 - 80.
One of them is -90, then find the
other​

Answer 1

Step-by-step explanation:

Let one integer = x

Let the other = y

 

Using these variables we can write a system of equations.

 

x + y = 18                 eq1

xy = 80                     eq2

 

 

If we substitute eq1 into eq2 so that we have only one equation with only variable, we obtain

 

x(18 - x) = 80

 

 

Distributing, we get

 

18x - x2 = 80

 

 

Subtract 18 and add x2 to both sides of the equation.

 

0 = x2 - 18x + 80

Answer 2

Answer:

Step-by-step explanation:

Let one integer = x

Let the other = y

Using these variables we can write a system of equations.

x + y = 18                 eq1

xy = 80                     eq2

If we substitute eq1 into eq2 so that we have only one equation with only variable, we obtain

x(18 - x) = 80

Distributing, we get

18x - x2 = 80

Subtract 18 and add x2 to both sides of the equation.

0 = x2 - 18x + 80

PLEASE MARK ME AS A BRAINLIST.