Question

4x-3y=17
x-y=4

Answer 1

what are you trying to do with this?

Answer 2

solve it i need help

Answer 3

You have three options: substitution, graphing, or ellimination.

I would take the second equation and solve it equal to x so basically, add the four to both sides.

Answer 4

so now you have x = y + 4.
Take the first equation and substitute this in for x (since it equals x!)

so: 4(y+4) -3y = 17

Answer 5

solve this for y.
then take your answer for y and plug it back in to the equation we created:
x=4+y and you'll have x!

Answer 6

but my teacher is telling me to add for each equation

Answer 7

add the two together?

Answer 8

Then your teacher wants you to use elimination. You need to get rid of one of the variables first. Say you want to get rid of the x. If you multiply that bottom problem by -4, then this is what you'll have:

(1st equation stays) 4x-3y=17
(2nd multiplied by -4) -4x+4y=-16

Add these two together which = 0x+y=1
SO y = 1

Now go back to the original: x-y=4 so if y=1, then x-1 =4 so x must be 5!

Answer 9

i need help

Answer 10

Did you understand the elimination method that I described? That is what you should follow.