Question

>>>use elimination to solve system of equations<<<
x+8y=3
4x-2y=7

Answer 1

notice how -2y can be multiplied by 4 to get -8y, which means 8y + (-8y) =0y = 0, so that goes away


so if you multiply everything in the second row by 4 you get this new equation 16x - 8y = 28

and you'll have this new system

x+8y=3
16x-8y=28


now add the equations


x+8y=3
16x-8y=28
-----------
17x+0y=31


17x = 31


solve this for x. Then use this to find the solution for y

Answer 2

(31/7,41/68)??

Answer 3

x should be 31/17 not 31/7

Answer 4

and y is incorrect, so try it again

Answer 5

Idk? I got the same thing

Answer 6

pick any equation with x and y in it, plug in x = 31/17 and solve for y


x+8y=3

31/17+8y=3 ... plug in x = 31/17

8y = 3 - 31/17

8y = 51/17 - 31/17

8y = 20/17

y = (20/17)*(1/8)

y = 20/136

y = 5/34


So x = 31/17 and y = 5/34

Answer 7

So you can plug it in to any equation and still gt th same answer?

Answer 8

yes because both equations were used to solve for x, which means that both x and y should make both equations true at the same time

Answer 9

so that's why you can pick any equation

Answer 10

Okay I know how to do them I just can't do them...

Answer 11

just keep practicing and you'll get better