Answer Key 237
- 428
23 8
xy
xy 3
22 y=
3 y=−
2 y = −4x + 8
y= −2x+ 4
2 x − 3(−2x + 4) = −8
2 x+ 6 x − 12 = −8
8 x = 4
x=^1
2
4
1
2
⎛ 28
⎝⎜
⎛⎛
⎝⎝
⎞
⎠⎟
⎞⎞
⎠⎠
+ 2 y
2 + 2 y= 8
2 y = 6
y= 3
x=
1
2
and y = 3 is the solution.
- − = → +
− ⎯→⎯→⎯→
−
24 + 82 ⎯⎯⎯⎯⎯⎯→→→− 48 =
27 =− 27 +=
1
xy+ 4 xy+ 4
xy− Multiply xy+
by
5 y= 15
y= 3
−2x − 3 = −7
−2x = −4
x= 2
x= 2 and y = 3 is the solution.
- 826826
313824 104
8
xy 2 xy 2
xy 3 xy 24
2 y= → 2
3 13 → 8 x+ =
−
Multiply
by
22 y= 110
y= 5
x − 3(5) = −13
x − 15 = −13
x= 2
x= 2 and y = 5 is the solution.
6.^24428
46 16 46 16
xy^2 xy 2
xy 6 xy 6
⎯→⎯→⎯→− 4 =−
6 y=−⎯ 16 ⎯⎯⎯⎯⎯⎯⎯→→→ 4 =−
−
Multiply
by
−8y = −24
y= 3
2 x + 3 = 4
2 x= 1
x=
1
2
x=^1
2
and y= 3 is the solution.
- 323
629
xy 2
xy 2
2 y=
22 y=
4
2
–2
–4
5
x≈ 1.33
y≈ 0.50
y
x
y = –3x +^9
2
y =^3
2
x –^3
2