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Answer asap only if you know solve by elimination 3x + 2y = 21 x - 4y = -7 show work plz and thx
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Answer asap only if you know

solve by elimination

3x + 2y = 21 x - 4y = -7

show work plz and thx

User Brijesh Vadukia
by
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1 Answer

2 votes
3x+2y=21

•add -2y to both sides
3x+2y=21
-2y -2y
3x= -2y+2y
•then divide both sides by 3
3x/3 = -2y+21/3
•your answer:
x=-2/3y+7


x-4y=-7

•add 4y to both sides
x-4y=-7
+4y +4y
•your answer:
x=4y-7
User Lordvcs
by
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