How do solve the following linear system?: # y=-6x-9 , -3x+7y=-1 #?

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Answer 1 · 2016-01-15T20:02:27

x = 62/-45
y = 33/45

We will solve it simultaneously,

put y = -6x -9 in -3x + 7y = -1

-3x + 7(-6x - 9) = -1

-3x -42x -63 = -1

-45x = -1 + 63

-45x = 62

              x = - 62/ 45

put x in y..

y = -6( -62/45) - 9

y = 372/45 -(9 *45/45)

y = 33/45