Need fast! where does the line y=x-9 cross the y axis? same with the line y=-2x-3 . give me a detailed method as well as an explanation as i need to know this for my end of year exam: )

Y = x - 9 meets the y-axis at (0,-9) y = -2x - 3 meets the y-axis at (0,-3) This is because for every linear equation, there is a formula corresponding to it as y=mx + c, where (0,c) is where it meets the y-axis. As we assign the value of 0 to x, only c will be left to equal y, being the intercept.