3 x + 2 y = 20 3x+2y=20 If x = 3 x=3 in the equation above, what is the value of y ?
+193 3x + 2y = 20 x = 3
substitute for x
3(3) + 2y = 20
multiply
9 + 2y = 20
subtract on both sides.
(9 - 9) + 2y = (20 - 9)
simplify
2y = 11
divide bothe sides by 2
2y/2 = 11/2
Evaluate 11/2 into a mix number
y = 5 1/2
y = five and one half.
