①+②, the equation (6x= 18) can be obtained.
), the solution is (x=3)
①-②, equation (4y=8
), the solution is (y=2)
So the solution of the equation is {1 (x=3)2 .(y=2)
2.( 1){-x+4y=9①，x+3y=5②
①+②，7y= 14，y=2。
Substitute y=2 into ① to get x=- 1.
(2){2x-3y=4①，5x-3y= 19②
①-②，-3x=- 15，x=5。
Substitute x=5 into ① to get y=2.
(3){2x+3y=-4①，x+2/ 1y=3②
3.(C) should be
{6x+9y=3，6x-4y=8。 .
agree
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