Get XY value from mathplotlib

Question

x = [-5,-4.19,-3.54,-3.31,-2.56,-2.31,-1.66,-0.96,-0.22,0.62,1.21]
y = [0.01,0.01,0.03,0.04,0.07,0.09,0.16,0.28,0.45,0.65,0.77]
plt.scatter(x, y)

new = np.linspace(-6, 2)
line, = plt.plot(new, inter(new, x, y))

xdata = line.get_xdata()
ydata = line.get_ydata()
print("X-datas: {}\n Y-datas: {}".format(xdata, ydata))

plt.show()

X-datas: [-6. -5.83673469 -5.67346939 -5.51020408 -5.34693878 -5.18367347 -5.02040816 -4.85714286 -4.69387755 -4.53061224 -4.36734694 -4.20408163 -4.04081633 -3.87755102 -3.71428571 -3.55102041 -3.3877551 -3.2244898 -3.06122449 -2.89795918 -2.73469388 -2.57142857 -2.40816327 -2.24489796 -2.08163265 -1.91836735 -1.75510204 -1.59183673 -1.42857143 -1.26530612 -1.10204082 -0.93877551 -0.7755102 -0.6122449 -0.44897959 -0.28571429 -0.12244898 0.04081633 0.20408163 0.36734694 0.53061224 0.69387755 0.85714286 1.02040816 1.18367347 1.34693878 1.51020408 1.67346939 1.83673469 2. ]

Y-datas: [-0.01204394 -0.00302114 0.00328497 0.00731081 0.00949282 0.01026743 0.01007108 0.0093402 0.00851122 0.00802059 0.00830473 0.00980007 0.01270645 0.01709244 0.02276363 0.02951097 0.03669359 0.04295611 0.04814326 0.0535818 0.06028353 0.06926028 0.08176299 0.09625576 0.11210497 0.12895267 0.14776008 0.16925751 0.19376669 0.22132663 0.25163393 0.28441688 0.31953663 0.35641761 0.39468924 0.43398094 0.47401019 0.51426535 0.55412183 0.59301685 0.63038764 0.66578449 0.69938197 0.73201447 0.7646666 0.79832295 0.83396812 0.87258672 0.91516335 0.96268261]

inter is function which is interpolates the datas, with that I get the outputed arrays.

How could I get a specific value from the fitted curve. Let's assume that X = -2.31 then I would like to get Y value from the fitted curve.