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help with subsituting and solving each system of equations

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x=-4y & 3x+2y=20

Mar 26th, 2015

x=-4y & 3x+2y=20

x= -4y...............................substituting in the second equation

3(-4y)+2y=20

-12y+2y=20

-10y=20

-10y/-10=20/-10

y=-2

x=-4y........therefore, x= -4(-2)=x=8

x= 8

y=-2

in proving the above,............................ x=-4y.........8= -2(-4) and 3x+2y=20= 3(8)+ 2(-2)=20

therefore, the value of x= 8 and the value of y=-2


Mar 26th, 2015

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