State which, if any, of the following lines are perpendicular. a) 4y=2x+12

b) 1/2y=x+5/2

c) 4y+2x=−16

d) 1/3y=x+2/3. Single choice.

Solve for the equation. 4x - 13 = 2x + 9

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?

The length of a lap is 15 meters. if lisa wants to swim 450 meters this week,how many laps must she swim