Question

use substitution method in system of equation to solve :

2x-y=10
2x-2y=4


a) (2.-1)
b) ( 7,4)
c) ( 2.-2)
d) ( 8,6)

Answer 1

Pretty please include ALL of the instructions when you post a problem. For example, in this case: "use substitution to solve the following system of linear equations."

To get you started: Please solve the first equation for 2x.

Answer 2

From the first equation, make y as the subject. That is
2x-y=10
2x-y + y=10 + y
2x = 10 + y
2x-10=10 + y - 10
2x - 10 = y
That is y = 2x-10.
Then substitute y = 2x-10 into the second equation to solve for x. Can you do it?

Answer 3

i can try thanks

Answer 4

Tell me what you have got when you finish :)

Answer 5

sorry got distracted with something else . its (8,6)

Answer 6

Hope it's not confusing for y ou, Geo, to have two different people suggesting that you try two different things. I suggested that you solve the first equation for 2x; RolyPoly suggested you solve it for y. Actually, either approach will work fine. Toss a coin and decide that way which to use on this particular problem. (RolyPoly's is the more traditional.)

Answer 7

Substitute your x=8 and your y=6 back into the original equations. Are they both "true"? If so, your solution actually is a solution.

Answer 8

its fine , it was right thanks both of y'all

Answer 9

Good going! Congrats!

Answer 10

thanks