Are you solving the problem or are you distributing it? If you are distributing it, them its (-3*4)+(-3*7) I will leave the problem solving to you.
Slope of the line passing through (7,-5) and (3,11) =

= -4
As two lines are perpendicular to each other, so when their slopes are multiply by each other, the answer will be -1
so the slope of the line passing through (-3,-9) and (5,n) will be

So will will get a formula below

and the answer will be n=
To find how much bags of lettuce there would be, multiply 3.5 times 4.
3.5 x 4 = 14
There are 14 bags of lettuce in the cooler.
Answer:

Step-by-step explanation:
For finding the system of equations you can use one of two methods. There's the elimination method and also the substitution method. For this I think the best way we could go at solving this is by using the elimination method. Since we can eliminate the 2y. We can then solve for x and then we'll go from there.

Now that we know what x is we can substitute it for one of the equations and then we will be able to solve for y.

So now we have the x and the y and once we place them together we can get the solution of those two equations, and the solution is
.