Question

Express - 7 by 9 as a rational number with numerator -28

Answer 1

let the denominater be x

now -7:9= 28:x

using cross multiplication

we get -7x=252

x =-36

-28/36=-7/9 hence prooved

Answer 2

Equation = -7/9 × ____ = -28/9
Let the missing number be x
-7/9× x = -28/9
x = -28/9 × 9/-7
x = 4
Or
-7/9 × 4/1 = -28/9