answersLogoWhite

0

A1:

7x-4y=9 , 3x+2y=15 and 7x-4y=9, 6x+4y=30 so 13x=39 x=3 now plug it in for y

9+2y=15 so y=3 A2:

The right expression is missing a + or - between the 3x and 2y. For the purpose of this demo, let's assume it is 3x+2y-15.

It can be solved by multiplying the right expression by 2, then add the expressions. That will eliminate y. Then solve for x. When x is known, plug its value into either of the expressions and solve for y. To start: 2(3x+2y-15)=6x+4y-30

adding the two

(7x-4y-9)+(6x+4y-30)=13x+0y-39=13x-39

solve for x

User Avatar

Wiki User

16y ago

Still curious? Ask our experts.

Chat with our AI personalities

RafaRafa
There's no fun in playing it safe. Why not try something a little unhinged?
Chat with Rafa
DevinDevin
I've poured enough drinks to know that people don't always want advice—they just want to talk.
Chat with Devin
EzraEzra
Faith is not about having all the answers, but learning to ask the right questions.
Chat with Ezra

Add your answer:

Earn +20 pts
Q: How do you solve this 7x-4y-9 and 3x 2y-15 find x and y?
Write your answer...
Submit
Still have questions?
magnify glass
imp