Solve for y.
-80 + y = 80
y=0
y=-160
y = 160

y = 160

Step-by-step explanation:

The given equation is expressed as

-80 + y = 80

It is a linear equation with only one variable. The variable is y. The constants on the left hand side of the equation and the right hand side of the equation are - 80 and 80 respectively. To determine the value of the variable, y, we would eliminate the constant on the left hand side of the equation by adding 80 to the left hand side of the equation and the right hand side of the equation. It becomes

-80 + 80 + y = 80 + 80

0 + y = 160

y = 160

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

mark branliest

step-by-step explanation:

.6 is 1/2 of 12

the answer is actually d. i just took the test