baylelandrye
baylelandrye
02-03-2018
Mathematics
contestada
solve using substition
2x+y=-16
-7x+9y=6
Respuesta :
zrh2sfo
zrh2sfo
02-03-2018
Solve the following system using substitution:
{2 x + y = -16
{9 y - 7 x = 6
In the first equation, look to solve for y:
{2 x + y = -16
{9 y - 7 x = 6
Subtract 2 x from both sides:
{y = -2 x - 16
{9 y - 7 x = 6
Substitute y = -2 x - 16 into the second equation:
{y = -2 x - 16
{9 (-2 x - 16) - 7 x = 6
9 (-2 x - 16) - 7 x = (-18 x - 144) - 7 x = -25 x - 144:
{y = -2 x - 16
{-25 x - 144 = 6
In the second equation, look to solve for x:
{y = -2 x - 16
{-25 x - 144 = 6
Add 144 to both sides:
{y = -2 x - 16
{-25 x = 150
Divide both sides by -25:
{y = -2 x - 16
{x = -6
Substitute x = -6 into the first equation:
{y = -4
{x = -6
Collect results in alphabetical order:
Answer: {x = -6 , y = -4
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