SOLUTION: *You want to get rid of the x by elimination in the system below. 3x + 4y = 7 4x � 2y = 24 If you multiply the top equation by 4, by which number will you multiply the bott

Question 330055: *You want to get rid of the x by elimination in the system below.
3x + 4y = 7
4x � 2y = 24
If you multiply the top equation by 4, by which number will you multiply the bottom equation?
*Which expression can be substituted for x in the top equation of the system below to solve the system by substitution?
2x + 10y = 1
x � 4y = �4

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
3x + 4y = 7....................1
4x � 2y = 24 ..................2
Multiply equation 1 by -4 and equation 2 by 3 to eliminate x
-12x-16y+12x-6y=-28+72
-22y=44
y=44/-22
y=-2
..
plug the value of y in equation 1
3x+4*-2=7
3x-8=7
3x=7+8
3x=15
x= 15/3
x=5
......
2x + 10y = 1
x � 4y = �4
x= (-4+4y)
2(-4+4y)+10y=1
-8+8y+10y=1
18y=8+1
18y=9
y=1/2
lug the value of y to get value of x
2x+10*1/2 =1
2x+5=1
2x=-4
x=-2
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