Can someone help me solve these two equations?

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Can someone help me solve these two equations?

3x - 5y = -12
x = 27y

HELP!?

2007-01-18 12:59:15 · 3 answers · asked by teddy 1 in Science & Mathematics ➔ Mathematics

3 answers

I decided to get crackin and figure out how to solve systems on my TI-89!
Of course I could have done this the traditional way just as well...
since x is already isolated in the second equation, plug it into the first and solve...
3(27y) - 5y = -12
81y - 5y = -12
76y = -12
y = -12/76 = -3/19
x = 27y = -81/19

2007-01-18 13:09:21 · answer #1 · answered by Joni DaNerd 6 · 0⤊ 1⤋

3x - 5y = -12
x = 27y

3(27y) - 5y = -12
81y - 5y = -12
76y = -12
y = -3/19

57(x) +15 = -228
3x = -243
x=81/19

x= -81/19
y= -3/19

2007-01-18 21:04:13 · answer #2 · answered by aficionado210 2 · 0⤊ 0⤋

(-81/19, -3/19)

2007-01-18 22:10:41 · answer #3 · answered by Crystal ♥'s Raymond 3 · 0⤊ 0⤋