Review
February 8, 2010
Answers
1) x = -7, y = 0
2) x = 0, y = 3
3) x = 10, y = 8
4) x = 6, y = 7
5) x = 8, y = 7
6) x = -2, y = -4
7) x = -6, y = -9
8) x = 9, y = 8
9) x = 6, y = -9
10) x = 2, y = 10
11) x = 3, y = -6
12) x = 8, y = 7
13) x = -8, y = 10
14) x = -8, y = 7
15) x = 8, y = -5
16) x = 4, y = -10
17) x = 9, y = 4
18) x = -2, y = -10
19) x = -4, y = -9
20) x = -8, y = 7
21) 14 boys; 21 girls
22) 14 yrs; 29 yrs
23) 40; 59
24) 22; 48
25) John 79; Henry 64
26) Flour 66 barrels; meal
33 barrels
27) 23 Holsteins; 40
Jerseys
28) $18; $26
29) 492; 587 votes
30) 16; 19; 21
31) x= 2, y= -9, z= -7
32) x=45, y= 42, z= -33
33) x= -11, y=37, z=27
1.) 5x + 2y = - 35
- 5x + 2y = 35
2.) x - y = - 3
x + 4y = 12
3.) 4x + 2y = 56
x - 2y = - 6
4.) 5x - 3y = 9
5x + 5y = 65
5.) - x - 5y = - 43
x + 3y = 29
6.) x + y = - 6
- 3x + 3y = - 6
7.) 4x + 2y = - 42
- 2x + 8y = - 60
8.) 5x + y = 53
3x + 4y = 59
9.) 5x + 4y = - 6
2x + 8y = - 60
10.) 3x - 2y = - 14
- 9x - 3y = - 48
11.) - 4x - y = - 6
- x - 4y = 21
12.) 3x + y = 31
- 3x + 3y = - 3
13.) x + 4y = 32
- 4x + 5y = 82
14.) 4x + 5y = 3
3x + 4y = 4
15.) - 4x - 4y = - 12
x + 5y = - 17
16.) y = 5x - 30
- 5y + x = 54
17.) 5y + 2x = 38
y = - 4x + 40
18.) 4x = y + 2
x = - 5y - 52
19.) x = - 5y - 49
5x + 3y = - 47
20.) x = - y - 1
x = - 2y + 6
In a class of 35 pupils there are 7 more girls
than boys. How many are there of each?
Find two numbers whose sum is 99
and whose difference is 19.
The sum of the ages of two brothers is 43 years, and
one of them is 15 years older than the other. Find their
ages.
Divide the number 70 into two parts, such that
one part shall be 26 less than the other part.
John and Henry together have 143 marbles. If I should give
Henry 15 more, he would have just as many as John. How many
has each?
In a storehouse containing 57 barrels there are 3 less
barrels of flour than of meal. How many of each?
A man whose herd of cows numbered
63 had 17 more Jerseys than Holsteins.
How many had he of each?
Two men whose wages differ by 8
dollars receive both together $44 per
month. How much does each receive?
were cast the successful candidate had
a majority of 95. How many votes did
each of the two candidates receive?
second is 3 more than the first and the
third 5 more than the first. What are
the numbers?
-4x + y - z = -10
-9x - y + 4z = -37
-8z = 56
-10x + 8z = -714
-7x + 9y + 5z = -102
-4x - 5y - 4z = -258
-x + y - 5z = -87
-x - 3y + z = -73
2x + 6y - 3z = 119