solve the following by elimination method x-3y=7,3x-3y=15
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x-3y=7 multiplying by 3
3x-3y=15 3( x- 3y = 7)
3x- 9y =21
from 2-1
3x-9y- (3x-3y)= 21-15
3x-9y- 3x+3y= 6 when y = -1
-9y+3y = 6 3x-9 x -1 = 21
-6y = 6 3x+9 = 21
y= 6/-6 3x = 21-9
y= -1 3x = 12
x = 12/3
x = 4
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