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Answer:
20
Step-by-step explanation:
1/2(a+b)=180
1/2(6+12)=18
1/2(18)=180
9/9=180/9
=20
21:3
9:3
3:1
there all a 3:1 ratio
The given equation is

Consider the slope-intercept form.

Rewriting the given equation in the slope-intercept form.

Subtracting 3x from both sides, we get

Dividing both sides by 5, we get



Compared to the slope-intercept form, we get m=-0.6 and b=1.4.
Hence the slope m= -0.60.