Use addition to solve the linear system of equations. Include all of your work in your final answer. 3x - y = 6
y = x - 4​

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

If you had $1,900,000, how many days would it take you to spend all if you spent $1 a second. (there are 86,400 seconds in a day)