Answer:
![37\ albums](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ddjidbn5bzj5d1kfwv3d6syssik5hjy7r3.png)
Explanation:
Let
x -----> the number of albums Floyd sold last month
we know that
The number of albums Floyd sold last month multiplied by $12 for each album plus a base rate of $200 must be equal to the total earned.
Last month he earned a total of $644
so
The linear equation that represent this problem is
![12x+200=644](https://img.qammunity.org/2020/formulas/mathematics/middle-school/yzef1gy37b04zfjcd3f376osdmy491lei2.png)
Solve for x
subtract 200 both sides
![12x=644-200](https://img.qammunity.org/2020/formulas/mathematics/middle-school/wrs8c9g1pvwzjlw2s8e7jx2nz41n1cnoo7.png)
![12x=444](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4tnlenk9oedmi4r1kzosl5z36sff6uey9j.png)
Divide by 12 both sides
![x=37\ albums](https://img.qammunity.org/2020/formulas/mathematics/middle-school/t9p4dz7by40xvoke0cxf1jzfmvvkyp9coj.png)