3. If 10x + 5y = 15 and 5x + 10y = 45 What is the value of x-y?
AJ 6 BJ -6 03 D136
Answers
Answered by
1
Answer:
-6
Step-by-step explanation:
10x+5y=15
5(2x+y)=15
2x+y=3‐---1
5x+10y=45
5(x+2y)=45
x+2y=9‐--------2
1-2
x-y=3-9
x-y=-6
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