Need help with 7, 8, and 9 plz :]

Jim makes $10.35 per hour. write an equation that jim can use to calculate his pay.

Which of the following circles have their centers in the third quadrant?

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13