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Mathematics
Gabby
11 March, 21:53
Substitution
-x + y=-5
3x-5y=9
+5
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1
)
Andres Marshall
12 March, 00:47
0
To subsitute you mean
make one side equal to only one placehloder
so - x+y=-5
make equal to y
add x to both sides
y=x-5
subsitute x-5 for y in second equation
3x-5 (x-5) = 9
3x-5x+25=9
add like terms
-2x+25=9
subtract 25 from both sides
-2x=-16
divide by 2
-x=-8
multiply - 1
x=8
subsitute 8 for x in first equation
y=x-5
y=8-5
y=3
x=8
y=3
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