<span>А(0;5) Т(-3;0)</span>
<span>(x-0)/(-3-0)=(y-5)/(0-5)</span>
<span>x/3=(y-5)/5</span>
<span>5x=3y-15</span>
<span>3y-5x-15=0</span>
<span>Ответ: 3y-5x-15=0</span>
1) (2x -1)/3 =5
2x -1 =5*3
2x -1 =15
2x =15+1
2x =16
x =8
2) (5 -2x)/3 =7
5 -2x =7*3
-2x =21 -5
-2x =16
-x =16/2
x = -8