Question

This is a substitution problem

Answer 1

They consists of equations and unknown variables. There are 4 PCs and 8 Mac in the room

System of equation

They consists of equations and unknown variables

Let the number of PCs be x

Let the number of Mac be y

If Mke has 12 computers, then;

x + y = 12

If there are two Macs for every PC in his classroom, then;

y = 2x

Substitute

x + 2x = 12

3x = 12

x = 4

Recall y = 2x

y = 2(4)

y = 8

There are 4 PCs and 8 Mac in the room

Learn more on system of equations here; brainly.com/question/14323743

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Answer 2

Answer:4 PCs and 8 Macs

Step-by-step explanation: