Question

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

@UsukiDoll

Answer 2

first put that c in equation A and then distribute the 2 on the left it's a

Answer 3

okay so its b

Answer 4

@triciaal @UsukiDoll

Answer 5

no

Answer 6

hold uppppppppp

Answer 7

can't we just subsitute that c = dsfsafjsldafdka into the first equation !

Answer 8

@UsukiDoll the question said to eliminate d first

Answer 9

dang... multiply by -3

Answer 10

but these questions are stupid.. because there is more than one way to solve it.

Answer 11

there are 4 ways to solve simultaneous equations

Answer 12

duh ^

Answer 13

its a

Answer 14

you know what? in general there is more than 1 way to solve this. this question sucks for being that one-sided.

Answer 15

the subsitution is obvious in here. take equation b and put it inside equation a and then distribute and eliminate the d . la lalaladsalkfjdlfjsdfj

Answer 16

the objective of solving by elimination is to make the coefficient of on variable equal and opposite so when the 2 equations are add the variable is eliminated. the result will be a linear equation solve for the one unknown