1. 2x + 2y = 10 y = 5 + x

Solve the system of linear equations by substitution. Check your solution

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm2. what is the area of the second triangle?

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)