SOLUTION: Solve each system by addition. a) x + y = 7 x - y = 9 b) x - 2y = -1 -x + 5y = 4 c) 3x + 5y = -11 x

SOLUTION: Solve each system by addition. a) x + y = 7 x - y = 9 b) x - 2y = -1 -x + 5y = 4 c) 3x + 5y = -11 x - 2y = 11 d) 2x = 2-y 3x + y = -1

Question 351021: Solve each system by addition.
a)
x + y = 7
x - y = 9
b)
x - 2y = -1
-x + 5y = 4
c)
3x + 5y = -11
x - 2y = 11
d)
2x = 2-y
3x + y = -1

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
a) Add the equations,

Then from the first equation,

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.
.
b)Add the equations,

Then from the first equation,

.
.
.
c)
1.
2.
Multiply eq. 2 by (-3) and add the equations together,

Then from eq. 2,

.
.
.
d) Rearrange the first equation, then subtract the first from the second,

.
.
.

.
.

Then from the first equation,

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