Question 158376
3x+3y=15 MULTIPLY BY 5
5x-5y=15 MULTIPLY BY 3 & ADD
15X+15Y=75
15X-15Y=45
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30X=120
X=120/30
X=4 ANSWER.
3*4+3Y=15
12+3Y=15
3Y=15-12
3Y=3
Y=3/3
Y=1 ANSWER.
PROOF:
5*4-5*1=15
20-5=15
15=15