# algebra

posted by .

solve the elimination methods
4x-9y=18.5
7y-2x=-10.5

• algebra -

Rewrite the second equation
-2x + 7y = -10.5 Now double it.
-4x + 14y = -21
5y = -2.5
y = -0.5

4x + 4.5 = 18.5
4x = 14
x = 3.5

## Similar Questions

1. ### Math

Solve by eliminnation methods 2x-4y=5 2x-4y=6 solve the system by elimination method 5x+2y= -13 7x-3y=17 Solve x+6<-7 or x+6>4 Determine whether the given numbers are solutions of the inequality 8,-10,-18,-3 y-8>2y-3 Solve …
2. ### MAT 101

Solve for X and Y in the following problems using either substitution or elimination methods. 2X + 5Y = 19 , 3X + 3Y = 15 4X + Y = 22 , 2X + 3Y = 16 12X + Y = 174 , 8X - 2Y = 36

4. ### math

Can someone help me solve the following....using elimination methods 1) 5x+7y=43 -4x+y=25 2)9x-9y=36 7y-3x=-14
5. ### Algebra

Solve by elimination method. 7r-3s=14 3r+7s=64 Could never figure out the elimination method. Would love some help with this one. Thanks
6. ### 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 …
7. ### 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
8. ### Math

Hi, I need help on this problem:Solve the system of equation by giving an ordered pair for 14x +3y = 115 7x +3y = 80 Use the 3 Methods in your work. Thank You, I am not sure how to use graphing, substitution, and elimination, please …
9. ### Algebra

Solve y= 2x+ 3 and y= 4x+3 I came up with the answers (0,3) using both substitution and elimination methods. What is the "independent" variable and "dependent" variable?
10. ### Pre-Calculus

Solve the system of equations using matrices. Use Gaussian elimination with back-substitution. x + y + z = -5 x - y + 3z = -1 4x + y + z = -2 I really need help.. 1 1 1 -5 1 -1 3 -1 4 1 1 1 -2 I've done so many different methods to …

More Similar Questions