Question

determine os valores correspondentes a x e y na igualdade:

X 3

4 Y

+

-1 5

8 Y

=

4 8

12 -6

Answer 1

$\left[\begin{array}{ccc}x&3\\4&y\\\end{array}\right]$ + $\left[\begin{array}{ccc}-1&5\\8&y\end{array}\right]$ = $\left[\begin{array}{ccc}4&8\\12&-6\end{array}\right]$

$\left \{ {{x -1 = 4} \atop {y - y = -6}} \right.$

x - 1 = 4.

x = 4 + 1 = 5.

y + y = -6.

2y = -6

y = -6/2

y = -3.

Prova:

x = 5 e y = -3, logo,

x - 1 = 4

5 - 1 = 4, confere.

y + y = -6

(-3) + (-3) = -6, confere.