Which best describes the relationship between the lines with equations -9x + 9y = 1 and 7x + 2y = 4?

Meee i honestly dont know what this question talking about

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?

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?