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Mathematics
Haley Hurley
28 June, 00:21
4x + 5y = - 28
-4x - 7y = 28
+2
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2
)
Matthias Kidd
28 June, 03:50
0
x = - 7, y = 0
Step-by-step explanation:
Solve the following system:
{4 x + 5 y = - 28 | (equation 1)
-4 x - 7 y = 28 | (equation 2)
Add equation 1 to equation 2:
{4 x + 5 y = - 28 | (equation 1)
0 x - 2 y = 0 | (equation 2)
Divide equation 2 by 2:
{4 x + 5 y = - 28 | (equation 1)
0 x - y = 0 | (equation 2)
Multiply equation 2 by - 1:
{4 x + 5 y = - 28 | (equation 1)
0 x+y = 0 | (equation 2)
Subtract 5 * (equation 2) from equation 1:
{4 x+0 y = - 28 | (equation 1)
0 x+y = 0 | (equation 2)
Divide equation 1 by 4:
{x+0 y = - 7 | (equation 1)
0 x+y = 0 | (equation 2)
Collect results:
Answer: {x = - 7, y = 0
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Sofia Rosales
28 June, 03:51
0
Answer: x = - 7, y = 0
Step-by-step explanation:
4x + 5y = - 28 (1)
-4x - 7y = 28 (2)
from equation (1)
4x + 5y = - 28
to make 'x' the subject of formula
4x = - 28 - 5y
divide both sides by 4
x = (-28 - 5y) / 4 (3)
substituting equation (3) into (2)
-4 [ ( - 28 - 5y) / 4] - 7y = 28
28 + 5y - 7y = 28
-2y = 28 - 28
-2y = 0
y = 0
substitute y = 0 into equation (1)
4x + 5 (0) = - 28
4x + 0 = - 28
4x = - 28
divide both sides by 4
4x/4 = - 28/4
x = - 7
Therefore, x = - 7, y = 0
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