Solve the following system of equations using elimination:
3x - 4y = 8
10x + 5y = 45
A. (-4, -1)
B. (3, 3)
C. (4, 1)
D. (8, 4)

Question

Solve the following system of equations using elimination: 
3x - 4y = 8 
10x + 5y = 45
	A.	(-4, -1)
	B.	(3, 3)
	C.	(4, 1)
	D.	(8, 4)

anonymous · Answer

3x - 4y = 8                              5(3x - 4y = 8)
10x + 5y = 45                          4(10x + 5y = 45)

anonymous · Answer

15x - 20y=40
40x+20y=180
55x = 220
x=4

3(4)-4y=8
12-4y=8
-4y=-4
y=1
solution is (4,1)

check 2nd equation: 10x + 5y = 45 
                                10(4)+5(1)=45
                                 40+5 = 45
                                   45=45

solution works