x+3y = 1300
2x+6y = 3900
solve using substitution methods..
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X=1300-3y
Put value of x in 2nd equation
2(1300-3y)-3y=3900
2600-6y-3y=3900
2600-9y=3900
-9y=3900-2600
Y=1300/-9
Y=-144.444
Put y = -144.44
X=1300-3(-144.44)
X=1300+433.32
X=1733.32
Put value of x in 2nd equation
2(1300-3y)-3y=3900
2600-6y-3y=3900
2600-9y=3900
-9y=3900-2600
Y=1300/-9
Y=-144.444
Put y = -144.44
X=1300-3(-144.44)
X=1300+433.32
X=1733.32
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