How do I solve the following by using substitution?

Y=4x+9

10x=18 - 2y

A survey from the Department of Motor Vehicles was given to local residents in the city of Slothville. The results showed that 60% held a valid driver's license.

What divided by 27 equals 11

A lawn is in the shape of a trapezoid with a height of 60 feet and bases of 70 feet and 130 feet. How many whole bags of lawn fertilizer must be purchased to cover the lawn if each bag covers 4000 square feet?

Find the quotient. 4/5 / 1/3

There are 100 senators in the 115th Congress. Democrats make up $/frac{46}{100}$ of the senators, and Republicans make up $/frac{13}{25}$ of the senators. The rest are Independents. What fraction of the senators are Democrat or Republican?

A motorboat travels 448 kilometers in 8 hours going upstream and 516 kilometers in 6 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Jack made 50% more smoothies than yesterday. If he made 30 smoothie today how many did he make yesterday?

Mr. Ramirez has enough money to fence one of his rose gardens, how many feet of fencing will he need if both gardens have the same perimeter

David saves $175 each month for the first 5 months. Then he saves $225 each month for the next 5 months. What is the average amount that David saves each month

Which of the following equations is not equivalent to the others? y = - 4 + 3 x y = - 3 x + (-4) y = - 3 x - 4 y = - 4 - 3 x