Answer:
B). -3
add the -1.4 to-3.5 then divide the solution
I got D for this one................
Given that Bananas are sold at Php 50 per kilo. The function that describes the situation will be as follows;
The total cost, c, of money required to by b kgs of banas will be given by:
c=50b
This shows that the total cost of a given number of kgs of bananas is given by:
c=50b
We are given a system of equations,

This will translate into a 2x2 matrix of coefficients (because 2 equations and 2 unknowns),

The matrix will then be applied to the vector (lower dimensions on top),

And the result vector will be whats on the other side of equals sign,

So to put everything together,

Hope this helps :)