70.1k views
1 vote
I need to know how to solver this coz I needy grades up

I need to know how to solver this coz I needy grades up-example-1

2 Answers

2 votes
The system is

2x + y = 8
x - y = 1

Let's solve this system using some of the steps outlined above.
1. Solve the first equation for y. To do this, subtract 2x from both sides:

0 + y = 8 - 2x => y = 8 - 2x
2. Now let's look at the second equation. See that y? We write out the
equation like this: x - ( y ) = 1
(Must use those parentheses!)
Whre you see y, write 8-2x instead:
x - ( 8-2x) = 1
3. Simplify this: x - 8 + 2x = 1
4. Combine like terms: 3x - 8 = 1; add 8 to both sides to isolate x:
5. Isolate x: 3x = 9
6. Sove for x: x = 3. Because x - y = 1, 3 - y = 1, so y must be 2.
7. Set out the solution: It's the point (3, 1).

Plese compare this solution with the one giv en in this problem. Can you find any errors in Jenny's approach? Please respond.
User Kiran Kumar Kotari
by
7.3k points
4 votes
Umm y = 2× + 8 ? Hard
User Indolent
by
7.6k points