The slope of the line is 
Explanation:
Given that a coordinate plane with a straight line passing through the points
,
and 
We need to determine the slope of the line.
The slope of the line can be determined using the formula,

Since, the points
,
and
lie on the straight line and the slope of all the points in a straight line have the same slope.
Hence, let us consider the points
and 
Let us substitute these points in the slope formula, we have,

Simplifying, we get,

Dividing, we get,

Hence, the slope of the line is 
If the temperature drops, then you must have subtract amount of drop from initial temperature.

The correct answer is the first one.
9 ten-thousands is 9*10,000=90,000. 90,000/10 is 9,000, or nine thousands.
(3x) + (x+60) = 180
4x + 60 = 180
Subtract 60 from both sides
4x = 120
Divide 4 from both sides
x = 30
The amount she has in hand, she can make 4 loaves of bread and 2 batches of muffins.
Hope this will help a lot!