Okay:
For line “l”: y=4
For line “m”: y=-2/1+4
For line “p”: x=-4
For line “n”: y=1x-1
First, open the parentheses (make sure you distribute the '-':
6x - 3x - 4 = x - 40
3x - 4 = x - 40
2x = -36
x = -18
The solution set is {-18}
The mean of a set of numbers is the sum divided by the number of terms.So, 20+24+12+44+68 / 5
mean = 33.6
Let x be the number.
5 - 2x = 7
5 - 5 - 2x = 7 - 5
-2/-2x = 2/-2
x = -1
The number is -1.