solve the system of equations using the addition (eliminatjion) method. 5x - 4y = 1 and -10x + 8y = -3?

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solve the system of equations using the addition (eliminatjion) method. 5x - 4y = 1 and -10x + 8y = -3?

2007-01-21 15:28:05 · 2 answers · asked by yashicaevans2004 1 in Science & Mathematics ➔ Mathematics

2 answers

Multiply the first equation by 2 and add that to the second equation.
10x - 8y = 2
-10x +8y = -3
0 = -1
Since this equation is false, there is no solution.

2007-01-21 15:36:47 · answer #1 · answered by MsMath 7 · 1⤊ 0⤋

5x - 4y = 1
-10x + 8y = -3

(5x - 4y) + (-10x + 8y) = 1 + (-3)
5x - 4y - 10x + 8y = 1 - 3
-5x + 4y = -2
4y = 5x - 2
y = (5/4)x - (1/2)

5x - 4((5/4)x - (1/2)) = 1
5x - 5x + 2 = 1
0x = -1
x = -1/0
x = Undefined

There is No Solution

2007-01-21 16:33:41 · answer #2 · answered by Sherman81 6 · 0⤊ 0⤋