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MATH QUESTION?????????? SUBSTITUTION!!?
Ok i need some serious help on this. I'm only in eighth grade so i'm a little confused.
Solve the first equation for x. Then substitute your result into the second equation and solve for y.
x + 2y = 1
6x - y = -20
Can you plz break this down for me???!!'Thank you!!!
2 Answers
- LucyLv 71 decade agoFavorite Answer
x + 2y = 1
6x - y = -20
It already tells you what you need to do. :)
First, solve the first equation for x.
x + 2y = 1
x + 2y - 2y = 1 - 2y
x = 1 - 2y
Substitute x with 1 - 2y in the second equation.
6x - y = -20
6(1 - 2y) - y = -20
6(1) + 6(-2y) - y = -20
6 - 12y - y = -20
6 - 12y - y - 6 = -20 - 6
-13y = -26
-13y / -13 = -26 / -13
y = 2
Plug this solved y value into x = 1 - 2y to solve for x.
x = 1 - 2y
x = 1 - 2(2)
x = 1 - 4
x = -3
ANSWER: point (-3, 2)
Check:
x + 2y = 1
-3 + 2(2) = 1?
-3 + 4 = 1?
1 = 1?
True
6x - y = -20
6(-3) - (2) = -20?
-18 - 2 = -20?
-20 = -20?
True
- Anonymous1 decade ago
The first one is:
-3 + 2(2) = 1
The second one is:
6(1) - (-14) = -20
Source(s): hehe
