The cost for 7 dance lessons is $82. The cost for 11 dance lessons is $122. write a linear equation,slope-intercept form, to find the total cost C for L lessons.
A slope equation you may not have learned yet is y = m(x-x1)+y1
You can find the slope my taking the two points and doing: (y1-y0)/(x1-x0)=m
In this case, your slope is 40/4 or 10. Now, to finish out the rest of the linear equation I presented,
simply pick a point and plug it in. y = 10(x-7) + 82. In this case, it wants your y variable to be C, so write C instead of y.
If you need the equation in y=mx+b, simply solve it out to get y= 10x + 12
