Question

(?,3)is on the line y = 2x+5. find the other half of the coordinate.

Answer 1

The other half of the coordinate is -1. Just plug 3 in for y and solve.

Answer 2

the answer is 1
y=2x+5
3=2x+5
-3= 2x+5-3 you subtract the 3, cancel the left side number(-3) and subtracter in the right side 5-3=2
2x/2+2/2
x=1