# math

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use subsitution system to solve
4x+5y=21
Y=3x-11

• math -

4x+5y=21
Y=3x-11

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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