Chapter 7 continued - NOHS Teachers

Chapter 7 continued
4.
5.
6.
4x y 10 6x 2y 22
7. 4x 7y 2
y 4x 10
2y 6x 22
x y 5
y
(3, 2)
1
1
x
Check: 6x 2y 22
63 22 ? 22
18 4 22
Solution: 3, 2
3x 5y 10
5y 3x 10
y 3 5 x 2
(10, 4)
4
Check: x 2y 18
10 24 ? 18
10 8 18
Solution: 10, 4
2x 3y 12
3y 2x 12
y 2 3 x 4
y 3x 11
y x 5
y x 5
4x 7x 5 2
4x 7x 35 2
11x 33
x 3
4x y 10
8. 7x 4y 5
43 2 ? 10
x 6y 19
12 2 10
x 6y 19
76y 19 4y 5
x 2y 18
42y 133 4y 5
2y x 18
46y 138
y 1 2 x 9
y 3
y
9.
2
x
y
4
(6, 0)
2
x
11.
Solution: 1, 3
3x 6y 24
2x y 1
y 2x 1
y 2x 1
3x 62x 1 24
3x 5y 10
3x 12x 6 24
310 54 ? 10
15x 30
30 20 10
x 2
Solution: 2, 3
x 3y 6
10. 5x y 7
3y x 6
4x 8y 12
y 1 3 x 2
y 5x 7
4x 85x 7 12
4x 40x 56 12
44x 44
x 1
Solution: 1, 2
x 6y 9
Check: 2x 3y 12
26 30 ? 12
x 3y 6
6 30 ? 6
x 4y 11
x 6y 9
12 12
6 6
6y 9 4y 11
Solution: 6, 0
6y a 4y 11
10y 20
y 2
Solution: 3, 2
3 y 5
y 2
y 2
Solution: 3, 2
x 63 19
x 1
22 y 1
y 3
y 3
51 y 7
y 2
y 2
x 62 9
x 3
176 Algebra 1
Chapter 7 Worked-out Solution Key
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