Question

1/2x - 1/4y= 7/2
3/4x + 1/3y= 19/2

To change into y=, do i multiply the top one by by 1/4 and the bottom one by -1/3?

Answer 1

You would multiply the top one by -4 and the bottom one by +3, if you want to keep y positive.

Answer 2

What do you have to multiply 1/4 by to get to 1?

4

1/2 x - 1/4 y = 7/2
Multiply across by 4:
2x - y = 14
y = 2x -14

Now multiply the second one across by 3 to finish it yourself.

Answer 3

thank yall(:

Answer 4

Well i can't seem to figure out the intersection on my calc. please help.