Posted by **ann** on Thursday, July 26, 2007 at 6:41am.

solve the systems of equation: First : 4x-2y = 2 Second: y = -4x-7

Should i solve by using substitution, elimination or multiply then use elimination?

Try adding them. Add up the left sides and the right sides (after rearranging the second equation) the x term will drop out, giving you

4x -2y = 2

-4x-y = 7

-3y = 9

y = -3

For x, substitute y=-3 into the first equation

x = (1/4)(2 +2y) = -1

## Answer This Question

## Related Questions

- algebra - I need a step by step explanation on how to add these two equations 2x...
- Math - x=-y+3 5x-y=-2 Solve using Elimination I already solved the equation ...
- algebra2 - solve the equation: First: x + 3y = 5 Second: 3x - y = 5 should i use...
- Algebra - 89. Solve for x in the equation: 6/7x - 6 = -2 I posted this before, ...
- simultaneous equations - Solve 2a + b = 3 4a - 5b = 20 My attempt Multiply the ...
- simultaneous equations - Solve 2a + b = 3 4a - 5b = 20 My attempt Multiply the ...
- algebra - can somebody help me out? am I doing this right? using the elimination...
- algebra - I just need a quick check before I hand in my work if you would......
- MATH PLEASE CHECK IT!!2 - m-2/m-5*m+5/m-2=-1 If your problem is this: (m - 2)/(m...
- algebra - i need help with these problems (either a solution or how to plug them...

More Related Questions