3. 5x - 4= y –2x + 2y = 8 a. The y variable is by itself. Circle the expression that is equal to the y variable. b. Substitute the circled expression for y in the second equation. c. Solve for x. d. Substitute the value for x into your original circled equation. Solve for y. e. Write your answer as an ordered pair. f. Check your Lesson 5.3 - Solving Systems by Substitution. Thanks for helping me if somebody does(:​

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Use circumcenter theorem to solve for the given values

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.