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MATH SOLVE
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3х - у = 66х + y = 21
4 months ago
Q:
3х - у = 66х + y = 21
Accepted Solution
A:
Answer:y=3 x=3Step-by-step explanation:use substitution method :3x-y=6-------(1)6x+y=21------(2) from (2),6x+y=21y=21-6x------(3)substitude (3) inside (1)3x-y=63x-(21-6x)=63x-21+6x=69x=27x=3if x = 3from (1), 3x-y=63(3)-y=69-y=6-y=-3y=3