Solve 2x +4y=8 and 2x+7y=9
Answers
Answer:
2x + 4y = 8
2x = 8 - 4y
x = (8 - 4y) / 2........(1)
2x + 7y = 9
put the value of x from equation (1)
2 ( ( 8 - 4y) / 2 ) + 7y = 9
(8 - 4y) + 7y = 9
8 + 3y = 9
3y = 9-8
3y = 1
y = (1/3)
substitute the value of y in equation (1)
x = ( 8 - 4 (1/3) ) / 2
x = ( 8 - 4/3 ) / 2
x = ( 20 / 3 ) / 2
x = ( 20 / 5 )
x = 4
therefore the value of ( x is 4 ) and ( y is 1/3 )
Answer:
I would say that you need to combine like terms and solve it that way. If you have cordinates like ( 3,1 ), substitue the variables with the X - value and if you get the Y - value your answer will be correct.
Step-by-step explanation:
2x + 4y = 8 and 2x + 7y = 9
2x + 2x = 4y + 7y
4x = 8 and 11y = 9
divide by 4 on both sides - x = 2
divide by both sides - x = 0.81818....
I'm not sure if this will work.