solving systems of equations: 1.) 2x + 9y = -13 2x - 3y = 23?
回答 (4)
2014-10-06 4:21 pm
2x + 9y = -13
2x - 3y = 23
12y = -36
y = -3
x = 7
2x - 3y = 23
12y = -36
y = -3
x = 7
2014-10-06 4:19 pm
Subtract one equation from the other, which will eliminate the x terms.
Solve the resulting equation for y.
Then use y to solve for x.
Solve the resulting equation for y.
Then use y to solve for x.
2014-10-06 3:53 pm
2x + 9y = -13
-[2x - 3y = 23]
---------------------
........12y = -36
........y = -3 answer//
solving for y from eq1
2x + 9y = -13
2x + 9(-3) = - 13
2x - 27 = - 13
2x = - 13 + 27
2x = 14
x = 7 answer//
-[2x - 3y = 23]
---------------------
........12y = -36
........y = -3 answer//
solving for y from eq1
2x + 9y = -13
2x + 9(-3) = - 13
2x - 27 = - 13
2x = - 13 + 27
2x = 14
x = 7 answer//
2014-10-08 5:39 am
2x + 9y = -13,
2x - 3y = 23
12y = -36
y = -3
x = 7
2x - 3y = 23
12y = -36
y = -3
x = 7
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