SOLUTION: Solve each system by the substitution method: #42 7y=9x -3x=4y

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Question 72859This question is from textbook Intermediate Algebra
: Solve each system by the substitution method:
#42
7y=9x
-3x=4y

This question is from textbook Intermediate Algebra

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
7Y=9X
Y=9X/7 NOW SUBSTITUTE (9X/7) FOR Y & SOLVE FOR X
-3X=4*9X/7
-3X=36X/7 NBOW CROSS MULTIPLY
-3X*7=36X
-21X=36X (X MUST =0)
THEN Y=0 ALSO