97南區第11題

[jungtime]

如題老師請幫忙

[thepiano]

令該線性關係為 y = ax + b

2a + b = 1.5
6a + b = 2

a = 1/8，b = 5/4

y = (1/8)x + 5/4

x = 3 時，y = 13/8 = 1.625