Question

Solve using elimination.
0 = -5y + 36 + 9x
18 = -6y + 4x

Answer 1

@Michele_Laino

Answer 2

Did you mean for the first equation to have 2 x terms?

Answer 3

Sorry I just changed it now.

Answer 4

Ahh ok, it just seemed odd for an elimination problem.

Answer 5

for example, we can multiply both sides of first equation by 6
and we can multiply both sides of the second equation by -5
so we get this:
\[\huge \begin{gathered}
0 = - 30y + 216 + 54x \hfill \\
\hfill \\
- 90 = 30y - 20x \hfill \\
\end{gathered} \]
now, please add together such equations

Answer 6

ok

Answer 7

hint:
left side:
\[\huge0 - 90 = ...?\]

Answer 8

whereas right side is:
\[\huge 30y + 216 + 54x + 30y - 20x = ...?\]

Answer 9

oops.. I made a typo:
right side:
\[ \Large - 30y + 216 + 54x + 30y - 20x = ...?\]

Answer 10

What I did first is i had the equation
(-36 = 5y + 9x)6
(18 = -6y + 45)-5

-216 = 30y + 54x
-90 = 30y - 20x
-306 = 34x

Answer 11

i know i made a mistake in here

Answer 12

it is right!

Answer 13

now, please solve for \(x\)

Answer 14

what is \(-306/34=...?\)

Answer 15

-9?

Answer 16

that's right, now please replace \(x=-9\) into the first equaton, and solve for \(y\)