Solve the following equations using trial and error. 8n = 64 2z + 3 = 23 3c - 4 = 14 2y - 10 = 8 3v + 9 = 15

Answer 1

8 just looks like the answer. take square root of 86, it's 8x8=64

8n=64

n = 8

8(8) =64

2z+3 =23

2(?)+3 =23

without doing the algebra, just guess what you need to fill in the ? with a number

8? too small, 9? too small. 10 works

2z+3 =23

2z =20

z = 10

2(10)+3 =23

3c-4 =14

3c =18

c = 6

3(6)-4 =14

2y-10=8

2y =18

y = 9

2(9)-10=8

3v+9=15

3v =6

v=2

3(2) + 9 = 15