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Solve the system of equations 3x – 3y = 30 and 2x + y = 11 by combining the equations.
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4 votes
Solve the system of equations 3x – 3y = 30 and 2x + y = 11 by
combining the equations.

User Nathan Prather
by
7.6k points

1 Answer

8 votes
Times bottom equation by 3 and top by 2 to get the same coefficient of x
6x-6y=60
6x+3y=33
Minus the bottom by the top
-9y=27
y=-3
substitute this in to one of the equations
2x -3 = 11
add 3 to both sides
2x=14
x=7
User Gaurav Tiwari
by
7.4k points
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