Question

solve the system by substitution
-4.5x-2y=-12.5
3.25-y=0.75

Answer 1

There is no x in the latter equation?

Answer 2

is the 2nd one supposed to be : 3.25x - y = 0.75 ??

Answer 3

if so...
3.25x - 0.75 = y

now sub 3.25x - 0.75 in for y in the other equation....then solve for x

Answer 4

did you solve it?

Answer 5

i didnt

Answer 6

do you still need help with it?

Answer 7

yes

Answer 8

Solve for y in your second equation

Answer 9

using the above and subbing it for y we get \[\frac{ -9 }{2 }x-2(\frac{ 13 }{ 4 }x-\frac{ 3 }{ 4 })=\frac{ -25 }{ 2 }\]
which becomes \[\frac{ -9 }{ 2 }x - \frac{ 13 }{ 2 }x +\frac{ 3 }{ 2 } = \frac{ -25 }{ 2 }\]

then we just move things around a bit and combine
\[-11x = \frac{ -25 }{ 2 } - \frac{ 3 }{ 2 }\]

then it's just \[-11x = -14 -> x = 14/11\]

Answer 10

from there you can just plug in your x value and solve for y

Answer 11

\[3.25(\frac{ 14 }{ 11 })-y=0.75 \rightarrow y = 3.25*\frac{ 14 }{ 11 }-0.75\]

Answer 12

still having a problem?