5x + 2y = 8
x + y = 4

if you want to solve the system of equations by addition, which of the following could you do?

a. multiply the second equation by 5 and add.
b. multiply the second equation by 2 and add.
c. multiply the second equation by -2 and add.

Ineed asap graph the system of equations 2x+y=5; 14+7y=35

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?