What number must you multiply the second equation by so that the sum of the x-coefficients is zero?
7x−y=55
x+3y=33
(1 point)
Responses
−7
negative 7
13
1 third
−13
negative 1 third
7
7
To make the sum of the x-coefficients zero, we need to find a number that, when multiplied by the second equation, cancels out the x-coefficient in the first equation.
The x-coefficient in the first equation is 7, so if we multiply the second equation by -7, the x-coefficient will become -7. This will result in a sum of x-coefficients being zero.
Therefore, the number we must multiply the second equation by is -7.