by isabela del castillo
(houston tx )
y=2x
x+y=21
Replace y = 2x into the second equation.
we get:
x + 2x = 21
we get
3x = 21
divide both sides of the equation by 3
3x/3 = 21/3
x = 7
replace x in either y = 2x or x + y = 21
y = 2 times 7
y = 14
Jul 25, 17 09:06 PM
Learn to solve comparison word problems using modeling
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Jul 25, 17 09:06 PM
Learn to solve comparison word problems using modeling