Substitute 18 - 6y for x in the first equation, and solve the resulting equation in y
36 - 12y -3y = 24
15 y = 12
y = 4/5.
2x - 12/5 = 24
2x = 26.4
x = 13.2
2x-3y=24
x+6y=18
substitution to solve system of equation. no sulution of infinitely many solutions
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