Question

matemática...........​

Answer 1

a) X + 15 = 7

7 - 15 = -8

X = -8

b) Y - 8 = 10

10 + 8 = 18

Y = 18

c) 6 + a = 12

12 - 6 = 6

a = 6

d) 2x - 3 = 7

7 + 3 = 10

10 ÷ 2 = 5

X = 5

e) 10 - X = 4

10 - 4 = 6

X = 6

f) 3 - X = 0

X = 3

g) 20 = Y - 8

20 + 8 = 28

Y = 28

h) 4a = -16

-16 ÷ 4 = -4

a = -4

i) 2Y - 1 = 8 + 1

8 + 1 = 9

9 + 1 = 10

10 ÷ 2 = 5

Y = 5

j) 10X - 9 = 91

91 + 9 = 100

100 ÷ 10 = 10

X = 10

espero ter ajudado :)