<span>The amount of dissolved oxygen in the Missouri River would decrease if large amounts of chemical waste were dumped into it. It would decrease because the chemical waste would feed on the microorganisms and reduce the amount of oxygen in the river.</span>
Find the slope of the line first:
5x - 2y = -6,
y = (5/2)x + 3;
Since we need a line that's perpendicular, m = - (2/5).
The only equation that has the slope of this m is 2x + 5y = -10;
Answer:
I'm not sure which you mean, so I'll give the answer to both:

Answer: slope is -3/10
Step-by-step explanation:
If you use the common denominator of .5 for both sides of the ratio, you will arrive at 3:5 as a simplified form.