Question

5x-9y=-42
3x+8y=68
Eliminate

Answer 1

which variable do you want to eliminate?

Answer 2

Yeah

Answer 3

which variable do you want to eliminate?
the answer is x or y (not yes or no)
which do you want to eliminate ?

Answer 4

sorry i don't care what one eliminated, i just need both x and y

Answer 5

In that case I would first pick x because it has smaller numbers in front of it.
the top equation has
5x
and the bottom equation has
3x

we want the least common multiple of 3 and 5 (the same problem as when adding fractions with a denominator of 3 and 5... what is a good common denominator? )
any idea ?

Answer 6

15

Answer 7

yes, that means if we make the number in front of the x's 15 we can get rid of x
in other words, multiply the top equation by 3 (that means every term and both sides)
and the bottom equation by -5 (I want to use -5 so we get -15x)
can you do that ?

just write down 3* top equation
and -5 times bottom equation
what do you get ?

Answer 8

actually gtg thanks for the help