There is a problem with the temperature sensor, resulting in a high temperature. As a result, the solar water heater no longer continues to heat the water in the water tank and the electric heating does not start. As a result, the water level sensor in the water tank is hot and the water level sensor is broken. As a result, the water supply is insufficient every time, and the display indicates that the water supply is very sufficient or full, so the water. The heater only heats a limited amount of water. As a result, the quantity of hot water is insufficient and the electric heating is broken. Perhaps the weather has not been very good recently and the lighting conditions are not very sufficient, resulting in insufficient heat. The single electric heater is damaged and is not heating the water in the water tank. Therefore, the water in the water tank is usually warm. The raThe main ison is that there is a problem with one or more of the above.
(1) As shown in the figure, the coordinates of the points (0, 2), 4, 8), 8, 14) and (12, 20) drawn in the Cartesian coordinate system of the plane are:
(2) We observe from (1) that these points are on the function y=kx+b
It is obtained from the points (0, 2) and (4, 8) The expression of the function is y=
| 3 |
| 2 |
Put the points (8, 14) and (12, 20) Analytical verification can show that these points are all at y=
| 3 |
| 2 |
(3) When y=30, x=
| 56 |
| 3 |
so Xiao Ming's statement is false .