The Circumference Worksheet Page 5
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10GRE PowerPrep Solutions
Test 1: First QR Section
Question 9 Test 1, First QR Section
If x and y are the tens digit and the...?
Answer: 12
Arithmetic: Multiplication
1. The GRE calculator only displays eight digits, so you would get an “Error” message if you tried
to solve this multiplication problem with the GRE calculator during the test. While you can
certainly multiply 725,278 by 67,066 by hand, you would waste valuable time (not to mention
open yourself up to careless mistakes) because you really only need to multiply the last two digits
of each number:
725278
OR
78
× 67066
× 66
4351668
468
53516680
4680
000000
5148
5076946000
+ 43516680000
x = 4, y = 8
48641494348
2. Now find the sum of x + y: 4 + 8 = 12
Question 10 Test 1, First QR Section
In the xy-plane, what is the slope...?
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Coordinate Geometry: Equation of a line
Answer:
2
1. You must know the equation of a line:
y = mx + b
Where: m is the slope, b is the y-intercept, and x and y are an x- and y-coordinate (x,y)
2. Convert the equation in the question to linear equation format:
3x – 2y = 8
–2y = –3x + 8
2
y
3
x
8
−
−
+
=
−
2
−
2
−
3
x
8
=
y
+
−
2
−
2
3
=
y
x
−
4
2
3
Since m = slope, the slope of this line is
.
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