Linear functions y = 2x + B whose graph passes through the point K (-2, -7).

Linear functions y = 2x + B whose graph passes through the point K (-2, -7). Calculate B. Check if it is a straight line passing through point L (2, 1).

To find B, we substitute the data of the point K into the equation of the function and solve it. -7 = -2 * 2 + b. -7 = -4 + b, do not forget about the transfer of signs here b = -7 + 4 = -3. B = -3. The equation is: y = 2x-3. A straight line passing through a point is the same as a point belongs to a straight line. To understand whether the point L belongs to a straight line, you need to substitute the coordinates into the found equation of the function and check whether the equality holds. We substitute. 2 * 2-3 = 1. Equality holds, which means that the line passes through point L.