How do you graph #x-y=3 #?
You must first put the equation into slope-intercept form (y = mx + b). To do this, subtract x from both sides to isolate y. Then, since y will be negative, divide each side by -1, resulting in y = x - 3. Since a 1 is understood to be in front of the x, the slope is 1. Also, the y-intercept will be (0, -3).
x - y = 3. Subtract x from both sides. -y = -x + 3. Divide each side by -1. Y = x -3. Plot the y-intercept (0, -3). To find other points, substitute any number in for x and solve for the y value. (ex: points (2, -1) and (-4, -7).