Question

解方程组4x²-9y²=15,2x-3y=5

Answer 1

4x²-9y²=15 (1)

2x-3y=5 (2)

(1)变形：(2x+3y)(2x-3y)=15

(2)代入（1）5(2x-3y)=15

2x+3y=3 (3)

[(2)+(3)]/4

x=2

[(3)-(2)]/6

y=-1/3

x=2 y=-1/3

以上是书写完整的答案.