Solve the given system of equations algebraically. Then sketch a graph to verify your solution or to show that no real solution exists. [Show all work.]

x^2 - 2x + y^2 + 4y - 4 = 0
x^2 + y^2 = 6

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

Multiply and simplify. (x - 4) (x^2 – 5x – 6) i will mark brainliest if your answer is right. show how you got the answer. if your answer is correct but does not show how you got the answer you will not be marked brainliest.