I know the answer to this
The pattern of the first one is multiplying x 1 x 10 x 100 x 1000 x 10000 if you want the next term multiply and one zero every time the next term is 30000
the pattern of the next one is start from january and skip one month the next term is july
1/0.62 = 950/x....1 U.S. dollar to 0.62 pounds = 950 dollars to x pounds
and since this is a proportion, we cross multiply
(1)(x) = (0.62)(950)
x = 589....so 950 U.S. dollars is equivalent to 589 British pounds
2y=1+5x (moving 5x to the other side) {equation 1}
Y= (1+5x)/2 (dividing both sides by 2)
Substitute {Y=(1+5x)/2} into equation: (-8x+9y=19)
Therefore giving you:
-8x+9(1+5x)/2=19
-8x+(9+45x)/2=19
(multiply through by 2 to remove the fraction)
-16x+9+45x=38
45x-16x=38-9(grouping like terms)
29x=29
Divide both sides by 29
X=1
Substitute X=1 into equation (-5x+2y=1)
-5(1)+2y=1
(-5)+2y=1
2y=1+5
2y=6
2y/2=6/2 (dividing both sides by 2)
Y=3.
:X=1 and Y=3
