trangtainhac
Calculators
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
trangtainhac
trangtainhac
Home
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
MATH SOLVE
Home
General
30 POINTS Solve by the linear combination method. 4x – 5y = –18 3x + 2y = –2(–2, 7)(–2...
4 months ago
Q:
30 POINTS Solve by the linear combination method. 4x – 5y = –18 3x + 2y = –2(–2, 7)(–2, 2)(–1, 3)(3, –1)
Accepted Solution
A:
4x – 5y = –18 (1st)
3x + 2y = –2 (2nd)
Multiply 1st equation by 2 and 2nd equation by 5
4x – 5y = –18 (1st) (mul. 2)
3x + 2y = –2 (2nd) (mul. 5)
8x - 10y = - 36
15x + 10y = - 10
-----------------------add
23x = - 46
x = -2
3x + 2y = –2
3(-2) + 2y = –2
-6 + 2y = -2
2y = 4
y = 2
(-2,2)
answer
(–2, 2)