Answer:
problem 1 2x+5y= 0
×=-1/2-5/2y
problem 2 y=1 3/7y y=-1.428571
7y=-10
problem 3 x=-7
problem 4 x-y=20
x=-20
Answer:
see explanation
Step-by-step explanation:
x³ + y³ ← is a sum of cubes and factors as
(x + y)(x² - xy + y²) ← in factored form
Answer:
c
Step-by-step explanation:
Answer:
63
Step-by-step explanation:
-7 * -9 = 63
negative times negative is always positive:)
