# Algebra 2 Helpp :(

posted by Robert

QUESTIONS (vvv)
(1) Solve the system by subsitution
2x + y = -11
3 - 4y = 11
(2) Solve the system by elimination
2x + 6 = -12
5x - 5y = 10
(3) What is the solution of the following system?
-3x - 2y = -12
9x + 6y = -9
(4) What is the solution of the following system?
x - y = 11
-x + y = -1

(1)
(3, 5)
(–5, –3)
(–3, –5)
(5, 3)

(2)
(2, 1)
(0, –2)
(–2, 0)
(1, 2)

(3)
(2, 1)
no solutions
(–2, –1)
infinitely many solutions

(4)
(–3, –4)
no solutions
infinitely many solutions
(3, 4)

1. Steve

assuming that without typos, you meant

2x + y = -11
3x - 4y = 11

from the first, y = -2x-11
substitute that into the second to get

3x - 4(-2x-11) = 11
3x + 8x + 44 = 11
11x = -33
x = -3
so, y=-2(-3)-11 = -5

On the others, if all else fails, try checking each of the proposed solutions. If you get stuck, show us where, and we can help you along.

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