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kev9369
26.07.2019 •
Mathematics
How do i solve each system by elimination![6x + 8y = - 10 \\ y = - 5x + 3](/tex.php?f=6x + 8y = - 10 \\ y = - 5x + 3 )
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Ответ:
{6 x + 8 y = -10 | (equation 1)
{y = 3 - 5 x | (equation 2)
Express the system in standard form:
{6 x + 8 y = -10 | (equation 1)
{5 x + y = 3 | (equation 2)
Subtract 5/6 × (equation 1) from equation 2:
{6 x + 8 y = -10 | (equation 1)
{0 x - (17 y)/3 = 34/3 | (equation 2)
Divide equation 1 by 2:
{3 x + 4 y = -5 | (equation 1)
{0 x - (17 y)/3 = 34/3 | (equation 2)
Multiply equation 2 by 3/17:
{3 x + 4 y = -5 | (equation 1)
{0 x - y = 2 | (equation 2)
Multiply equation 2 by -1:
{3 x + 4 y = -5 | (equation 1)
{0 x+y = -2 | (equation 2)
Subtract 4 × (equation 2) from equation 1:
{3 x+0 y = 3 | (equation 1)
{0 x+y = -2 | (equation 2)
Divide equation 1 by 3:
{x+0 y = 1 | (equation 1)
{0 x+y = -2 | (equation 2)
Collect results:
{ {x = 1, y = -2
Ответ:
3y=12+8x
2)divide by 3 to solve for y
y=4+8/3x
y=8/3x+4
8/3x is the slope, 4 is the y-intercept