Explanation for Question 9 From the Math (No Calc) Section on the Official Sat Practice Test 9
Okay. Question nine gives us this graph. 2 And it says that a system of three equations is graphed in the X, 3 Y plane above. How many solutions does the system have? 4 So the main thing that we need to know for this question is, 5 is it solutions just refers to when the two graphs or in 6 this case, when the three equations intercept a solution is when they're all, 7 they all have the same Y value for the same X value. 8 And we can see that all three intersect rate here 9 and all three intersect rate here, 10 there are other intersections, um, 11 or excuse me, there are other intersections between two of the equations such as 12 right here, but that one doesn't count because it doesn't have an intercept for 13 all three. So from there we see that there are two solutions to 14 the system above.