Question

to solve the equations by elimination, what could you muiltply each equation by to cancle out the x variable A:6x-3y=-4B:-4x-y=5answers a: muiltply A by 2 and B by 3 b: muiltply A by a and B -3 c: muiltply A by 4 and B by -4d: Muiltply A by 3 and B by -1

Answer 1

The coefficients of variable x in equation 6x - 3y = -4 is 6 and in equation -4x - y = 5 is -4.

So coefficients of x in both the equation can be made equal to each other by multiplication of 6 by 2 and multiplication of -4 by 3.

So after multiplication by 2 to equation 6x - 3y = -4, coefficients of variable x is 12, and after multiplication by 3 to equation -4x - y = 5, coefficients of variable x is -12 which cancels out each other on addition.

So correct answer is A option muiltply A by 2 and B by 3