What's the answer?
for this
Georgette has n books. Jackie has half as many books. How many books does jackie have?
2x-y+=-9
3x-8y=-7
using the substitution method.
2 answers
from the first equation,
y = 2x+9 (ignoring the spurious + sign)
substituting that into the second equation,
3x - 8(2x+9) = -7
3x - 16x - 72 = -7
-13x = 65
x = -5
so, y = -1
y = 2x+9 (ignoring the spurious + sign)
substituting that into the second equation,
3x - 8(2x+9) = -7
3x - 16x - 72 = -7
-13x = 65
x = -5
so, y = -1