IDNStudy.com, ang iyong destinasyon para sa malinaw na mga sagot. Ang aming mga eksperto ay nagbibigay ng mabilis at eksaktong sagot upang tulungan kang maunawaan at malutas ang anumang problema.
to find the values of x and y using substitution method you'll have:
x = -y+7 ---equation1
x-y = -9 ---equation2
-------
Substitute equation 1 to equation 2
x - y = -9
(-y+7) - y = -9
-y + 7 -y = -9
transpose 7 to the right side of the equation
-y - y = -9 - 7
-2y = -16
divide the whole equation by -2
y = 8
-------
Substitute y=8 to equation 1 to get the value of x
x = -y + 7
x = -(8) + 7
x = -8 + 7
x = -1
------
therefore x=-1 and y=8