Question

solve by elimination method
2a+4b=12
-2a+b=18

Answer 1

What do you think the first step should be?

Answer 2

@Avon just add both of the equations
2a+4b=12
-2a+b=18
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What do you get?

Answer 3

gypsy&@uri 4b=6

Answer 4

@gypsy1274

Answer 5

How? +4+1a=5a and 12+18=30

Answer 6

I mean 5b*

Answer 7

Break it into terms.
\(2a-2a\) in the first column

Answer 8

\(4b+b\) in the second column.

Answer 9

i meant 5b=30

Answer 10

yes.

Answer 11

Now, solve for b.

Answer 12

2a+4b=12
-2a+b=18
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5b=30
Divide 30 with 5
b=30/5
b=6.

Answer 13

Now you have the value of b now solve for a
Put the value of b in eq no(1)

2a+4b=12
2a+4(6)=12

Solve it.

Answer 14

now im lost but would it b 2a+24=12 @uri

Answer 15

2a+24=12
Subract 24 both sides now..

Answer 16

@uri 2a=12

Answer 17

2a=-12

Now divide -12 with 2

Answer 18

6

Answer 19

-6 ans.

so a=-6 and b is 6.

Answer 20

thanks @uri