math
posted by lc .
use subsitution system to solve
4x+5y=21
Y=3x11

4x+5y=21
Y=3x11
4x + 5(3x  11) = 21
4x + 15x  55 = 21
19x = 21 + 55
19x = 76
x = 4
y = (3 * 4)  11
y = 1
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