For the first one its a slope of -2/3
The second one is 4/5
and the third one is -1/7
I am pretty sure that it would be 13m + 8. All you have to do is combine the like terms.
I think it’s positive. As it gets heavier, the cost has a positive slope, or increases. I’m not absolutely sure though
X - 4y = 2.....multiply by -3
3x + 2y = 6
-------------
-3x + 12y = -6 (result of multiplying by -3)
3x + 2y = 6
------------add
14y = 0
y = 0
3x + 2y = 6
3x + 2(0) = 6
3x = 6
x = 6/3
x = 2
solution is (2,0).....so the graph that has the two lines intersecting (crossing) at (2,0) is gonna be ur graph
B = 100(1 + 0.04)^12 = 100(1.04)^12 = 100(1.601) = $160.10