1.) Solve thesystem of equations by any method.2x+5y=21 7x+2y=15 Enter the exact answer as an ordered pair,(x,y)

2.) Solve thesystem of equations by any method 6x+11y=17 x+2y=5

3.) Solve thesystem of equations by any method. x+2=1 4x8y=5

4.) Solve thesystem of equations by any method. 4x+16y=36 x4y=9

5.) A fast-food restaurant has a cost of productionC(x)=12x+72and a revenue functionR(x)=8x. When does the company start to turn a profit?

Enter the exact answer.

x = ?

6.) Use a system of linear equations with two variables and two equations to solve.

A number is10more than another number. Twice the sum of the two numbers is48. Find the two numbers.

Enter the numbers in increasing order.

First Number= ? Second Number = ?

7.) Use a system of linear equations with two variables and two equations to solve. 280students enrolled in a freshman-level chemistry class. By the end of the semester,7times the number of students passed as failed. Find the number of students who passed, and the number of students who failed.

Passing Students = ? Failing Students = ?

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