Answer:
System A should be solved by elimination because you can easily cancel out the 3m to solve.
System B should be solved by substitution. Since the an equation for the y value is given, you can easily substitute it into the other equation.
System C should be solved by graphing. You don't have to worry about any slopes or intercepts to graph. You can graph it using only whole numbers.
Answer:
23
Step-by-step explanation:
f(x)=3 − 4x
Let x=-5
f(-5) = 3-4(-5)
= 3 -(-20)
= 3+20
=23
