In order to solve the following system equations by addition which of the following cool you do before adding the question so that one variable will be eliminated when you’re at them
2x-4y=5
6x-3y=10

y=-5/9 and x=25/18

Step-by-step explanation:

2x-4y=5

6x-3y=10

Multiple the top by -3

-6x+12y=-15

6x-3y=10

Add both equations

9y=-5

y=-5/9

Plug in y to any equation to find x

6x-3(-5/9)=10

6x+5/3=10

Multiple by 3

18x+5=30

18x=25

x=25/18

Watch out for negative signs

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

answ5

step-by-step explanation:

u have to pay atttion to me