Answer:
If y = - 15 , x = 70 and if y = 7 , x = 26
Step-by-step explanation:
2y + x = 40 ............1
y^2 = 4x - 55 ..........2
From equation 1, x = 40 - 2y ........3
Substitutr equation 3 into equation 2
y^2 = 4( 40 - 2y ) - 55
y^2 = (160 - 8y ) - 55
y^2 = 160 - 8y - 55
y^2 = 160 - 55 - 8y
y^2 = 105 - 8y
y^2 + 8y - 105=0
y^2 + 15y - 7y - 105 = 0
( y^2 + 15y ) - ( 7y + 105 )= 0
y (y + 15 ) - 7 (y + 15 ) = 0
(y + 15 ) (y - 7 ) = 0
y + 15 = 0 OR y - 7 = 0
y = - 15 y = 7
Substitute the value if y into equation 3
If y = - 15
x = 40 - 2( - 15 )
x = 40 + 30
x= 70
If y = 7
x = 40 - 2 ( 7 )
x = 40 - 14
x = 26
2 opposite interior angle (opposite to the exterior angle) added together are equal to the exterior angle
6x-1+85 = 18x
6x +84 = 18x
subtract 6x from both sides
84 = 12x
divide both sides by 12
x = 7
<em>hope this helps! </em>
Answer:
Do you have a picture?
Step-by-step explanation:
Answer:
see below
Step-by-step explanation:
2x^2-3x-5=0
Well a=2, b=-3, c=-5
