Answer:
Option C.
Step-by-step explanation:
The given equations are


We need isolate one of the variables, such that it appears by itself on one side of the equation.
Isolating a variable in two equations is easiest when one of them has a coefficient 1.
In equation 1, coefficient of B is 1. So, we can easily isolate one of the variables.
The equation is

Subtract 3A from both sides.

Multiply both sides by -1.

Therefore, the correct option is C.
Answer:
Function 2 is linear
Step-by-step explanation:
It is linear because all of the numbers that in x roc is 1 and y is -4
Answer:
rounded to the nearest 10 is 840
rounded to the nearest 100 is 800
Step-by-step explanation:
Answer:
The two ratios are equivalent.
Step-by-step explanation:
Reduce both fractions:
6/21 = 2/7 [Take out 3 from both sides]
8/28 = 2/7 [Take out 4 from both sides]
2/7 = 2/7