Y=-2x+1, y=-2/3x+5 solve using substitution

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

If y varies directly as x2 and y=6 when x=6, find the constant of variation.