Question

3d + c = 7
2d - c = 6
solve for d and c

Answer 1

add the two equations together lined up as you have it

Answer 2

\[3d+2d=5d\]
\[-c+c=0\]
\[7+6=13\]

Answer 3

so you get
\[5d+0=13\] or just
\[5d=13\] then to get d divide by 5 and have
\[d=\frac{13}{5}\]

Answer 4

now replace d by
\[\frac{13}{5}\] ini either equation and solve for c via
\[3\times \frac{13}{5}+c=7\]
or
\[2\times \frac{13}{5}-c=6\]

Answer 5

i will pick the first one
\[\frac{39}{5}+c=7\]
\[c=7-\frac{39}{5}\]
\[c=-\frac{4}{5}\]

Answer 6

i know now thanks ")

Answer 7

yw

Answer 8

its actualy so simple lol...eh guess im just tired