Question

4X+5y=98 5X-4y=2 的解

Answer 1

4X+5y=98 (1)

5X-4y=2 (2)

由(2)

5X==4y+2

X=(4y+2)/5

代入(1)

4(4y+2)/5+5y=98

16y+8+25y=490

41y=482

y=482/41

X=(4y+2)/5=402/41