Question

solve by substitution method
3x + 4y = 7
-9x + y = 31
the solution is ----
type an ordered pair or
there is no solution

Answer 1

(-3,4) is what my ti83 practice tells me :)

Answer 2

\[\left[\begin{array}c 3&4&|&7\\-9&1&|&31\end{array}\right]\]
\[\left[\begin{array}c 1&0&|&-3\\0&1&|&4\end{array}\right]\]

Answer 3

so my answer is -3 and 4 which is the ordered pair i messed up along the second half thanks

Answer 4

yep; the substitution method is alot of effort; but when you keep track of it all, its an intuitive method

Answer 5

thanks again i wanna be your fan