2x-y=8
7x-3y=28
what is the solution..SO confused and frustrated...please help

Question

2x-y=8
7x-3y=28
what is the solution..SO confused and frustrated...please help

anonymous · Answer

let's use elimination method of solving system of equations.
This means we need the -y in the first equation to become +3y.
So we must first multiply the first equation completely by -3

anonymous · Answer

does that make sense?

anonymous · Answer

yes

anonymous · Answer

once we do that we have to add the equations together.

anonymous · Answer

but its asking me to use the substitution method and express as an ordered pair

anonymous · Answer

isolate the y in the first equation

anonymous · Answer

the ordered pair will be found once we know x, and y.
(x,y)

anonymous · Answer

ok

anonymous · Answer

2x-y=8
-y=8-2x
y=-8+2x  substitute y for -8+2x in the second equation to solve for x

anonymous · Answer

7x-3y=28
7x-3(-8+2x)=28
you can work out the rest by yourself yes?