Answer:
The slope of the line is 0. It's a horizontal line.
Explanation:
Slope of a Line
Suppose we know the line passes through points A(x1,y1) and B(x2,y2). The slope can be calculated with the equation:
![\displaystyle m=(y_2-y_1)/(x_2-x_1)](https://img.qammunity.org/2021/formulas/mathematics/high-school/41kulvff1pgimoc7unwlsr8pc5vgedtyrp.png)
We are given the points (12,-18) (-15,-18).
Calculate the slope:
![\displaystyle m=(-18-(-18))/(-15-12)](https://img.qammunity.org/2021/formulas/mathematics/college/a2jz12yi7tv2d2t3ouzvea7n0t50lhg9p6.png)
![\displaystyle m=(-18+18)/(-27)](https://img.qammunity.org/2021/formulas/mathematics/college/ehdj9k8knak1bjtq81ifsqkns6l9be1tk7.png)
![\displaystyle m=(0)/(-27)=0](https://img.qammunity.org/2021/formulas/mathematics/college/fpbqlb2pog9b9gaz8623qmzk2mjeqjrgr1.png)
The slope of the line is 0. It's a horizontal line.