A graph pairs an input on the horizontal axis with an output on the vertical axis. At a given temperature, move up to the line, then across to read the pressure. Read the axis labels and scales, not the number of grid squares. The tempting slip is giving the input temperature when the question asks for pressure.
Hints
- Hint 1
The input is the value you start with. Temperature is on the horizontal axis, so find the given temperature there. Which point on the line is directly above it?
- Hint 2
The output is what the graph gives you for that input. From where you meet the line, move straight left to read the pressure on the vertical axis.
Step-by-step
Read the pressure from the graph
Step 1Locate the given temperature
No Desmos needed. Read the answer off the graph. Temperature is the input on the horizontal -axis. Find the given temperature, kelvins, and move straight up to the line. That point pairs the temperature with its pressure.
- Step 2
Read the matching pressure
Move left from that point to the vertical axis. The output is . The pressure axis increases by psi per mark, so use its labels rather than counting marks as single psi. At kelvins, the estimated pressure is psi. Choice B.