Answer:
Step-by-step explanation:
2x-6y=2
....(1)
-4x+8y=-8....(2)
divid the equation (2) by : - 2 x +4y = - 4...(3)
add (1) and (3 ) :2x-6y - 2 x +4y =2-4
-2y=-2
y = 1
put y=1 in (1) : 2x-6(1)=2
2x=8
x =4
1) I put them in two separate brakets.
2) I solved it by equating both of them.
450 seconds I got this by multiplying
20 - 8 = 12
8H = $4 x 8.... 32
12 x $2 = $24
$32 + $24 = $56