212 Easy Algebra Step-by-Step
Exercise 20
For 1–3, solve by the substitution method.
- xy
xy
24 yy=−
27 xy+=y
- 43
313
xy
xy 33
- 428
23 8
xy
xy 3
22 y=
3 y=−
For 4–6, solve by the elimination method.
- − =
−
24 + 8
27 =−
xy+ 4
xy−
- 826
313
xy 2
xy 3
2 y=
3
- 24
46 16
xy
xy 66 y=−
For 7 and 8, estimate solutions by using the graphing method.
- 323
629
xy 2
xy 2
2 y=
22 y=
- 7142
14 711
xy 1
xy 7
1144 y
7