The sum of all the angles in this line equals 180
a+90+21=180
a+111=180
a=69
Answer:
4x-1y=3xy
Step-by-step explanation:
because 3-2=1 and add the y on and the do 4x-1y and that will = 3xy
3x=e^5
x=(e^5)/3
............
Answer: Choice B)
(y+5)+y = 6
----------------------------------------------------------------
So what we do is start with x+y = 6. We can replace the 'x' with (y+5). This replacement is possible because x = y+6; ie x and y+6 are the same. Another term for "replace" is "substitute"
This is how we're able to go from x+y = 6 to (y+5)+y = 6