How to multiply by two

What is the solution to this system of equations? 5x-3y=10 3x+3y=3

The sixth grade is charging $9 per car to wash cars. The fifth grade is charging $8.50 per car. Suppose each grade washes 50 cars. How much more money will the sixth grade earn?

The dimension of the row space of a 3 x 5 matrix A is 2 d. What is the dimension of the solution space of the homogeneous system Ax = 0?

Using complete sentences, explain the key features of the graph of the cosine function.

What is the value of 6x-3y if x=5 and y = - 1

Y varies inversely as x. When y = 18, x = 6. Find the constant of variation and determine the value for y when x = 27.

A sandwich shop has three types of sandwiches: ham, turkey, and chicken. Each sandwich can be ordered with white bread or wheat. Customers can add any combination of the four available toppings.

When my teacher says find (a) but i found it, what does she mean?

You order 4 fish sandwiches and a hamburger. The cost of the hamburger is $2.50 your total bill before taxes $14.30. Write and solve an equation to find the cost of a fish sandwich.

Elliot is standing at the top of a store escalator that leads to the ground floor below. The angle of depression from the top of the escalator to the floor is 42.51 degree, and the escalator is 16 feet long.