Math help please!!!!!!! :]

can someone please help me with these 2 problems thanks :]


4.Select the best possible first step to solving the system by first eliminating the y variable.

x - 12y = -2
3x + 4y = 18

Multiply the first equation by -3.
Multiply the second equation by -3.
Multiply the first equation by 3.
Multiply the second equation by 3.



5.Select the best possible first step to solving the system by first eliminating the x variable.

3x + 5y = 1
2x + 4y = -4

Multiply the first equation by 2 and multiply the second equation by 3.
Multiply the first equation by -2 and multiply the second equation by 3.
Multiply the first equation by -2 and multiply the second equation by -3.
None of the above



thanks :]

Multiply the second equation by 3

Multiply the first by -2 and the second by 3

This really depends on whether your teacher teaches elimination by adding or subtracting. Personally I prefer to add them, but its up to preference.
So, the answers;
Elimination using addition:
4) multiply 2nd equation by 3
5) multiply the first equation by -2 and then multiply the second equation by 3.

Elimination using subtraction:
4) multiply 2nd equation by -3
5) multiply the first equation by 2 and then multiply the second equation by 3.

To eliminate the first variable just multiply the equation for the negative coefficient of the other equation:

For your first question (4.), just multiply the second equation by +3 and sum them up.

The next question is the same

:)

4.)....multiply the second eq. by + 3. ( and add which cancels the 12y.)

5.)......multiply the firsr eq by minus 2 ( gives a - 6x )and the second eq by plus 3 and subtract
to eliminate the x.

4. Multiply the second equation by 3 to cancel out y
5. Multiply the first equation by -2 and the second problem by 3 that would cancel out x
Ur welcome :)

Question 4.
Multiply the second equation by 3.

Question 5.
None of the above