algebra URGENT!
posted by Laura .
Solve the system using elimination.
2x – 2y = –8
x + 2y = –1
And this one:
Solve the system using elimination.
3x – y = 28
3x + y = 14
Pleease help me :(

1st:
add them
3x = 9
x = 3
back into #2
3 + 2y = 1
2y = 2
y = 1
2nd:
add them
6x = 42
x = 7
in the 2nd:
21 + y = 14
y = 7
Respond to this Question
Similar Questions

College Algebra
Please help! x2y+z=7 2x+yz=0 3x+2y2z=2 a. Solve the above system of equations using Gaussian Elimination or GaussJordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule. 
Math
Please help! x2y+z=7 2x+yz=0 3x+2y2z=2 a. Solve the above system of equations using Gaussian Elimination or GaussJordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule. 
algebra
i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y  1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of equations … 
Algebra/Elimination method
Solve using the elimination method. If the system has no solution or an infinite number of solutions, state this. 27x  18y = 180 9x + 6y = 60 
algebra 2
Nonlinear homework... Solve the system by elimination. 1)y=x^2+2 4xy=10 2) Solve the system using substitution. Y=3x^2+x2 Y=5x+3 
algebra 2
Nonlinear systems Solve the system by elimination. y=x^2+2 4xy=10 Solve the system using substitution. y=3x^2+x2 y=5x+3 
Algebra
X2y=1 2x+y=4 solve each system using elimination. Tell whether the system has one solution, many solutions, or no solution. 
Algebra Multiple Choice
Hello, This is the last of questions I have for my practice assignment. Again I will put what I got. Thanks for your help. 1.) Solve the system using substitution. Write answer as an ordered pair. 4x+2y=8 5x2=y A.) First equation … 
Algebra 1
solve each system using elimination. 1.) 6x  3y =15 7x + 14y =10 Tell whether the system has one solution, infinitely many solutions, or no solution. 1.) 9x +8y =15 9x +8y =30 2.) 5x  3y =10 10x + 6y = 20 
Math
1. Solve the system using elimination. 3x+3y=27 x3y=11 a. (8,1) b. (3,6) c. (6,3) d. (4,5)*** 2. Solve the system using elimination. 4x7y=3 x7y=15 a. (12/5,10/7) b. (1,2) c. (6,3)*** d. (1,1/7) 3. Solve the system using elimination. …