6x+8y=6
x-32y=-99
Solve using elimination, Plese Help

Question

6x+8y=6
x-32y=-99
Solve using elimination, Plese Help

anonymous · Answer

multiply the first equation by $4$ and start with 
$$24x+32y=24\
x-32y=-99$$ then add them up

anonymous · Answer

Why 4?

anonymous · Answer

add them up and you will see why 4

anonymous · Answer

Ok I asked so I know how to start other problems. how do you know what number to multiply by

anonymous · Answer

do you see that when you add the $y$ terms go away? that was the point

anonymous · Answer

Yes

anonymous · Answer

$$24x+32y=24\
x-32y=-99$$ adding gives 
$$25x=-75$$ no y's so you can solve for $x$ alone

anonymous · Answer

multiplying by 4 is what made that work
you have to figure that part out on your ownb
what number would you multiply by to make one variable go away when you add

anonymous · Answer

sometimes you have to multiply both equations by some number
not in this case because 32 is a multiple of 8

anonymous · Answer

oohh ok. so i got -3x and to solve for y I do the same?

anonymous · Answer

no

anonymous · Answer

first off i assume you mean $x=-3$  right?

anonymous · Answer

Right

anonymous · Answer

then since you know what x is , you do not have to redo the procedure
replace x by -3 in either equation and solve for y

anonymous · Answer

$$x-32y=-99\
-3-32x=-99$$ etc

anonymous · Answer

(-3,3)?

anonymous · Answer

yup

anonymous · Answer

Thanks A lot