all the sides of the triangle are the same because this is equilateral. this means:
(21 - x) = (2x - 3) = (x + 5)
Let's take (x+5) and (2x - 3)
x + 5 = 2x - 3 subtract x from both sides
5 = x -3 add 3 to both sides
8 = x you can rearrange this to x=8
Now it's the fun part! SUBSTITUTION! :D (sarcasm)
<u>BUT WAIT</u> Remember, all of the sides are equal to one another! That means we only have to solve for one side!
Let's do the top side. 21 - 8 = 13
Since there are 3 sides in a triangle, we can easily multiply the 13 by 3
13 x 3 = 39 The perimeter is 39 inches
Answer:
416
Step-by-step explanation:
plz mark brainliest!
As we know the formula to calculate the slope is m = y2 - y1 divided by x2 - x1.
Where m is the slope. y2 is the second y co ordinate. y1 is the first y co ordinate. x2 is the second x co ordinate. x1 is the first x co ordinate.
So to calculate we can write it out as -7 = v - (-5) / 5 - 7, which further becomes -14 = v + 5 and v comes out to be -19.
Answer:
(-1, 4)
Step-by-step explanation:
11x+5y=9
11x+3y=1
subtract side-by-side
- 5y-3y= 9-1
- 2y=8
- y=4
- 11x+20=9
- 11x= -11
- x=-1