Since we know that all angles in a triangle add up to 
, we can solve for 
and substitute it back into 
to find 
.
Remove the parentheses and combine like terms.
Add 
to both sides of the equation.
Divide both sides of the equation by .
Now that we have the value of , we can substitute it back into to find .
I hope it can help you hehe
Answer:
yes, the ordered pair is a solution for this equation
Step-by-step explanation:
y= -x-2
plug in 1 for x and -3 for y
-3= -1-2
-3= -3
Answer to the problem you are asking is d
Take a look at f(x) = -x + 1. Its slope is negative and its y-intercept is +1.
Right away, we can eliminate the 3rd and 4th graphs, because they show positive slopes for x≤1.
Take another look: f(x) = -x + 1. When x = 0, y = 1. Thus, the y-intercept is (0,1).
The first graph shows this intercept correctly; the second does not. So the correct answe is "the first graph."
