1. 3
2. 18
3. 13
4. 12
5. 18
1. 12
2. 65
3. 55
4. 60
5. 3
1)
5x - 2 = 2x + 7
5x - 2x = 2 + 7
3x = 9
x = 3
2)
XY = 5x + 3
XY = 5(3) + 3
XY = 15 + 3
XY = 18
3)
XZ = 5x - 2
XZ = 5(3) - 2
XZ = 15 - 2
XZ = 13
4)
ZY = 2x + 6
ZY = 2(3) + 6
ZY = 6 + 6
ZY = 12
5)
LM = 4x + 6
LM = 4(3) + 6
LM = 12 + 6
LM = 18
65 = 5y + 5
65 - 5 = 5y
60 = 5y
12 = y
5y + 5
5(12)+5
60 + 5
65°
3.
4y + 7
4(12) + 7
48 + 7
55
4.
65 + 55 + x = 180
x = 180 - 120
x = 60
5.
5x + 5 = 20
5x = 20 - 5
5x = 15
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Answers & Comments
Answer:
TEST A
1. 3
2. 18
3. 13
4. 12
5. 18
TEST B
1. 12
2. 65
3. 55
4. 60
5. 3
Solution:
TEST A
1)
5x - 2 = 2x + 7
5x - 2x = 2 + 7
3x = 9
x = 3
2)
XY = 5x + 3
XY = 5(3) + 3
XY = 15 + 3
XY = 18
3)
XZ = 5x - 2
XZ = 5(3) - 2
XZ = 15 - 2
XZ = 13
4)
ZY = 2x + 6
ZY = 2(3) + 6
ZY = 6 + 6
ZY = 12
5)
LM = 4x + 6
LM = 4(3) + 6
LM = 12 + 6
LM = 18
TEST B
1)
65 = 5y + 5
65 - 5 = 5y
60 = 5y
12 = y
2)
5y + 5
5(12)+5
60 + 5
65°
3.
4y + 7
4(12) + 7
48 + 7
55
4.
65 + 55 + x = 180
x = 180 - 120
x = 60
5.
5x + 5 = 20
5x = 20 - 5
5x = 15
x = 3