Which value of y makes the equation y+4.2=21 true? I NEED THE ANSWER ASAP I ONLY HAVE 20 MINS TO COMPLETE

A. y = 16.8
B. y=17.2
C. y=17.8
D=25.2

A: 16.8

Step-by-step explanation:

4.2 and 16.8 both have decimal place values. If you line up the decimals when you add them, then you get 21.

an

y = 6x -3y -12

y +3y +12 = 6x

=> . x = { 2y / 3 +2 } this is equation of line in terms of x

=> . if line meets the x-axis the co-ordinates of meeting point would be ( x , 0 )

=> . x = 2 ( 0 ) / 3 + 2

=> . x = 2

so, the point is ( 2 , 0 )

a reflection across the x axis and a 90 degree rotation left and right.