Which is one of the steps in finding the solution to a system of linear by substitution?

Fill in the blank to complete the statement about one step in finding the solution by substitution: ____________ to the second equation the value of the variable found, then solve the resulting equation to find the value of the other variable.

Choose the expression which can be substituted to x in the equation y = x + 6 to find the value of the other variable in the system x + y = 14

Choose the expression which can be substituted to x in the equation x – y = - 9 to find the value of another variable in the system x + y = 7

Find the solution to the system

– 2x + y = 5

3x – 2y = -5

Find the solution to the system

2x + 5y = 9

-x + y = 2

Mrs. Rosie bought a kilogram of mango and calamansi for the total amount of ₱75.00. The other day she bought another 2kg of mango and 3kg of calamansi for a total cost ₱185. How much is the price of calamansi per kilogram?

There were 100 students in a fundraising exhibit. The entrance fee is ₱5.00 for math club members while the ₱10.00 for non-members. The officers collected a total amount of ₱800.00. How many tickets were sold for members?

A certain part of the amount of money was invested at 15% and the rest at 10% rate. The total interest after one year is ₱3325. If the total amount invested was ₱27,000, represent the situation using systems of linear equation in two variables.

How much was invested at each rate of 15% and 10% in problem No.9?