Answer:
3/5
Step-by-step explanation:
15x+9y+189
9y=-15x+189
y=-5/3x+21
the slope its -1/15
the whole equation is:
15x+9y=189
subtract 15 on both sides
9y= 15x +189
divide 9 on 15 and 189
y= -9/15x +21
