Solve each linear equation by subsitution or elimination

4x-y=-1

2x+y=7

All values equivalent to 1/2

Kate has a coin collection. She keeps 7 of the coins in her box, which is only 5% of her entire collection. What is the total number of coins in Kate's coin collection?

Solve for x: 3 (9-8x-4x) + 8 (3x+4) = 11

Tony spent $100 on books to give away as prizes to his students. At the store, he bought 4 more books than planned, spending $5 per book Which equation can be used to find the number of books he originally wanted to buy, 12

Solve the equation 3x-13y=2

Gina sold 5/8 of a mushroom pizza and 3/4 of an onion pizza to the same family. How much pizza in all did the family buy?

Find the area under the standard normal curve to the left of z = 0.49 and to the right of z = 2.05. Round your answer to four decimal places, if necessary.

Anna's dog shadow has 9 rope pull toys. that is 3 more than 1/2 of shadows toys. how many toys does shadow have?

What is the definition of factored form

Twenty-nine billion, thirty-two million in standard form