Math
Solve for both systems: 10x+z=31 and 9x + 2z = 40
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Asked by
AnneS2
Last updated by
anonymous
10x+z=31
10x-10x+z=31-10x
z=31-10x
9x + 2z = 40
9x + 2(31-10x) = 40
9x + 2(31) (2)(-10x) = 40
9x + 62-20x = 40
62-11x = 40
62-11x -62= 40-62
-11x=-22
-11x/-11=-22/-11
x=2
z=31-10x
z=31-10(2)
z=31-20=11