Solve by substitution.
y=16-5x
y=3x

Question

Solve by substitution.
y=16-5x
y=3x

solomonzelman · Answer

substitute 3y for x into the first equation.

rina.r · Answer

and will be the 5x for y

solomonzelman · Answer

y=16-5x
y=3x

y=16-5x   ->    y=16-5(3y)     ->     y=-16-15y
y=-16-15y
y+15y=-16-15y+15y
16y=-16
y=-1

solve for x
(-1)=3x
x=-1/3

y=1
x=-1/3

anonymous · Answer

thank you so much that helped a lot. it says i need an ordered pair. would it just be (-1,3)??

charlotte123 · Answer

@SolomonZelman YOU'RE GOOD! GREAT JOB! :D

unklerhaukus · Answer

there are a few typos, so be careful , 

but you final answer , the order pair is the coordinate (x,y)

anonymous · Answer

soo (-1,1)?

unklerhaukus · Answer

y=16-5x
y=3x

sub Eqn 2 into Eqn 1

3x=16-5x
    =
  x=

anonymous · Answer

okay so i'm confused with the ordered pair now

solomonzelman · Answer

(x,y)
if x=-1/3  and y=-3
what is the ordered pair?

anonymous · Answer

is it (-1/3,-3) could it be a fraction?

solomonzelman · Answer

i don't know why not.

shamil98 · Answer

y = 16 - 5x
y= 3x
3x = 16 - 5x
8x = 16
x = 2

y = 3(2)
y = 6.

@SolomonZelman you did this wrong.

anonymous · Answer

Your answer should actually be the ordered pair (2,6). That substitution isn't correct..
$$y=16-5x$$$$y=3x$$
$$3x=16-5x$$$$8x=16$$$$x=2$$
So
$$y=6$$
Solution: (2,6)

solomonzelman · Answer

Sorry guys

anonymous · Answer

Be really careful with those substitutions to make sure you are making correct mathematical statements!

shamil98 · Answer

$$\huge \frak That~brain~fart.$$

charlotte123 · Answer

LOL

happinessbreaksbones · Answer

LOL

anonymous · Answer

thanks for helping!

shamil98 · Answer

$$\huge \frak You~are~very~welcome. ~~=)$$