Find the vertex or else ill fail my class

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

The dance committee of pine bluff middle school earns $72 from a bake sale and will earn $4 for each ticket they sell to the spring fling dance. the dance will cost $400 write an inequality to determine the number, t of tickets the committee could sell to have money left over after they pay for this year's dance. what is the solution set of the inequality?