Maybe more than you’d want to change now, but you could use an input where students are required to enter the coordinates using correct notation. Then, for your graph CL:
number(“x_1”): numericValue(parseOrderedPair(targetInput4.latex).x)
number(“y_1”): numericValue(parseOrderedPair(targetInput4.latex).y)
Check @JayChow’s example here: