¡¡¡40 ! what is the equation of the line that passes through (-3,0.5) and (3,-0.5) ? explain in full detail. i would very much like an explanation. i will report answers that are not relevent to my question. you in advance : )

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?