Solve the system of equations 2x+y+z=1 2x-y-3z=-3 x-2y-4z=-2

 {x,y,z} = {2,-8,5} 

i had this question before

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)