Selve each pair of simultaneous equations by substitution method
y = 2x
x+y=9​

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Heather is a cashier. she can ring up 1212 customers in 99 minutes. at this rate, how many minutes does it take her to ring up 44 customers?

If f(x) = 4 - xand g(x) = 6x, which expression is equivalent to (g-1)(3)? 6-3-(4 + 3)2 6-3-(4-32) 6(3) - 4+32 6(3)-4-32