y=3x+11

Question

2x+y=1

method: __________

x= ____________

y= _____________

Answer 1

y=3x+11
2x+y=1

2x + 3x + 11 = 1

5x = -10

x = -2

Now, substitute - 2 for x in the first equation to find the value of y.

Answer 2

thanks.

one more...

x+4y=12
2x-3y=6

How do you know if it's substitution or what?

Answer 3

I used substitution. Why don't you try substitution on the last set of equations?

I'll be glad to check your answer.

To start you off --
x = 12 - 4y

Answer 4

2+12-4y-3y=6
14-7y=6
-7y=-8
y=8/7

x+4(8/7)=12
x+32/7=12
x=52/7

Is that right? My teacher said something to us about that you shouldn't have fractions.