Question

Plz help!!
A system of equations is shown below:

Equation A: 2c = d − 8
Equation B: c = 3d + 8

Which of the following steps should be performed to eliminate variable d first?

Multiply equation B by 2.
Multiply equation A by 2.
Multiply equation B by 3.
Multiply equation A by −3.

Answer 1

D Because to eliminate d we have to multiply A by -3

-3 and 3 eliminate each other so
Multiply equation A by -3

Answer 2

Make sense?

Answer 3

wouldent you want to multiply equation B by -3 not A?

Answer 4

If we do that we will have this system of equations
2c = D - 8
-3c = -9d - 72

D variables cannot be eliminated here!