# Algebra

posted by .

solve the linear system using substitution
4x - y=5
4x + 4y= -4

Also by using elimination.

• Algebra -

substitution: since you have y = 4x-5,
4x + 4(4x-5) = -4
20x = 16
x = 4/5
y = -9/5

using elimination, subtract one equation from the other to get

5y = -9
y = -9/5
now solve for x to get x=4/5

## Similar Questions

1. ### Algebra - solving linear equations w/ substitution

The question in the book reads: "Suppose you try to solve a system of linear equations using substitution and get this result. How many solutions does each system have?
2. ### algebra 1

Got a test tomorrow... Say you have a system of equations (linear), that you can solve using substitution, graphing, or elimination. Without solving the equations, can you tell if there is one solution, many solutions, or no solution?
3. ### Algebra

Solving system of linear equations by using the apropiate method name the method and the x,y coordinates 1)X=4y+8 2x-8y=-3 2)3x-7y=6 elimination method 2x+7y=4 (2,0) 3)5x-2y=12 elimination method 3x-2y=-2 (7,23/2) 4)9x-8y=42 elimination …
4. ### 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 …
5. ### algebra 2

Nonlinear homework... Solve the system by elimination. 1)y=x^2+2 -4x-y=10 2) Solve the system using substitution. Y=-3x^2+x-2 Y=-5x+3
6. ### algebra 2

Nonlinear systems Solve the system by elimination. y=x^2+2 -4x-y=10 Solve the system using substitution. y=-3x^2+x-2 y=-5x+3
7. ### algebra

solve the linear system from problem 1 using elimination 4x-y=5 4x+4y=-4
8. ### algebra 1

1. Solve the linear system using substitution. 4x-y=5 4x+4y=-4
9. ### math

how do i solve this linear system using substitution or elimination -16x+2y= -2 y=8x-1
10. ### 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 -5x-2=y A.) First equation …

More Similar Questions