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Solve this using substitution x plus 2y equals 30 x2 plus y2 equals 900?
Wiki User
∙ 14y ago
x+2y = 30 => x= 30-2y
x2+y2 =900
(30-2y)2+y2 = 900
(30-2y)(30-2y)+y2 = 900
900-60y-60y+4y2+y2 = 900
5y2-120y = 0
y(5y-120) = 0
y = 0 or y= 24
Substitute the value of y into the original equations to find the value of x:
Therefore: x = -18 and y = 24
Check: -18+48 = 30 and (-18)2+242 = 900
Wiki User
∙ 14y ago
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