Answer:
15 pounds
Step-by-step explanation:
The required system of equations is 
Step-by-step explanation:
We need to write a system of linear equations that has the ordered pair (1,4) as it's solution.
It means we need to find system of linear equations, which after being solved gives x=1 and y=4
Let the system of equations be:

I have made equations such that adding x+y gives 5 i,e (1+4=5) and subtracting x-y gives -3 (1-4=-3)
Now solving this system of equations to find value of x:

Adding eq(1) and eq(2)

Putting value of x=1 into eq(1) to find value of y

The solution set after solving system of equations is (1,4).
The required system of equations is 
Keywords: System of equations
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Answer:
A. 50
Step-by-step explanation:
Okay, its like 1,2,3,4
you want to look at the first number
the one right next to the decimal.
0.099, 0.174, 0.28, 0.679
the first number to the right of the decimal is the key to it all
sometimes you may have 2 that have the same first decimal so you would compare the second next. its really simple
5x-7+9x
I don't actually know if this is correct 100% but I'm pretty sure it is a linear expression.