Question

How would you use the elimination method to solve the following system of equations.
2x + 9y = 4
3x + 7y = –7

Answer 1

Would it just be like a normal equation. ?
2x + 9y = 4
3x + 7y = –7

5x+16y= -3
??????????

Answer 2

no - u need to eliminate either the x term or y term by adding or subtracting the equations
you cant do that as they stand because the coefficients ( that is number before the x and y are different)

Answer 3

one way to eliminate x is by multiplying first equation by 3 and second by -2 and then adding
can you do that operation?

Answer 4

when multiplying equations be sure to multiply EACH TERM

Answer 5

are you with me?

Answer 6

(2x + 9y = 4) times 3
(3x + 7y = –7) times 2
so every term must be timed.

Answer 7

@cwrw238 sorry it took me so long. Okay i miltipled each equation. now do i add them or subtract?

Answer 8

subtract.

Answer 9

type what you got here.

Answer 10

6x+27y=12
6x+14y=-14
13y=26
/13 /13
y=2
now how do I solve for x? put 2 into one of the equations?

Answer 11

yep, that is correct.