Question

encontre o valor de cada letra:
a) x + 15 = 19
b) x - 7= -10
c) 8 . x = 40
d) 54 : x = 6

e) 250 = 5
x

f) 4 = 28
x 7

Answer 1

a) x + 15 = 19
 x = 19 - 15
   x = 4

b) x - 7 = -10
   x = -10 - 7
   x = -3

c) 8 * x = 40
    x = $\frac{40}{8}$
    x = 5

d) 54 ÷ x = 6
    x = 6 × 54
    x = 324

e) $\frac{250}{3} = 5$
   250 = 5x
    5x = 250
     x = $\frac{250}{5}$
     x = 50

f) $\frac{4}{x} = \frac{28}{7}$
   28 = 28x
   28x = 28
    x = $\frac{28}{28}$
    x = 1