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
Sep 11, 17 05:06 PM
Easy to follow solution to 100 hard word problems in algebra
New math lessons
Your email is safe with us. We will only use it to inform you about new math lessons.