Hi. You have two different expressions for the number x (each of them in terms of y). Those expressions must be equal. Write the equation:solve by elimination …
x = 2/3 + 1/3y …
x = 2/5 + 7/5y …
That's because x is a fraction. Now solve the equation for y. If you need to clear the fraction first, multiply each side by 4.I obtain fractions such as
15/4 - 7y = 2
The left-hand side is correct.. The right-hand side is not correct.15 - 28y = 24 …
I missed your edit above. We had set your two initial expressions for x equal to one another.… I don't see how you obtained 10 + 5y = 6 + 21y …
Isn't Linear Algebra always fun?!Good. That equation is correct.
It seems like it's been a long time since you've had to do arithmetic and basic algebra by hand. Is that right? I'm wondering also why you're trying to teach yourself linear algebra topics. Is it for fun?