`@` `color[#480209][d]``color[#81020E][t]``color[#A80111][t]`

Đáp án:

1:

a) `y=ax-4a` `(a ne 0)`

`M(2;1) to x=2;y=1`

Thay `x=2;y=1` vào hsbn ta có :

`y=ax-4a`

`1=a(2-4)`

`1=-2a`

`a=-1/2(tm)

`-` Hsbn cần tìm : `y=-1/2x+2`

b) T/c:

`y=0 to x=4 to A(4;0)`

`x=0 to y=2 to B(0;2)`

2:

a) `y=ax+1` `(a ne 0)`

`M(1;-2) to x=1;y=-2`

Thay `x=1;y=-2` vào hsbn ta có :

`y=ax+1`

`-2=a+1`

`a=-3(tm)`

`-` Hsbn cần tìm: `y=-3x+1`

b) T/c:

`y=0 to x=1/3 to A(1/3;0)`

`x=0 to y=1 to B(0;1)`