How to do number 4 . how do i do infinite solutions

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

Which of the following equations is equivalent to x/3-6/x=1

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?