For 3x-8y=5,x+2y=1 please need it fast
Answers
Answered by
0
Answer:
x= 9/7 and y= -1/7
Step-by-step explanation:
3x-8y=5••••> 1
x+2y=1••••••>2
equation 2 multiplied by 3 so that x can be cancelled =
3x+6y=3••••>3
substract equation 3 from 1
we get (3x-8y) - (3x+6y)= 5 -3
(3x-8y) - 3x - 6y = 2
•
•
•
•
bracket opened positive 3x got converted to negative 3x and positive 6y got converted to negative 6y.
-8y -6y = 2
-14y = 2
y = -2/14= -1/7
equate y vale in equation 2 or 3 or 1 I am using 2 for purpose of easiness.
x+2y=1
x+( -1/7 x 2) = 1
x+ -2/7 = 1
x = 1 + 2/7
x= 9/7
Similar questions