We have one of those equations already solved for y, so let's sub that one into the other one and solve the equation in terms of x only:

. We will simplify that and at the same time bring the 6 over by subtraction to get a polynomial set to equal 0 that we can factor.

. We will factor that to get (x-3)(x+1) for x values of x = 3 and x = -1. a above is the choice that has the x values we need, -1 and 3.
Hi there,
So lets look at this problem. Ron has 20 pennies. Pam has 20 pennies. If Ron has 4 groups each group will have 5 pennies to add up to 20. Pam will have 5 groups and each group will have 4 pennies to add up to 20.
Therefore Ron will have more pennies in his group.
Let's simplify the above expression :
Let x be the number of adult tickets sold and 84 - x be the number of children tickets.
105x + 60(84-x) = 7155
Once you find x (number of adult tickets), find the children tickets with 84 - x