X=5+y
x+y=-15
subsitute 5+y for x
5+y+y=-15
5+2y=-15
minus 5 from both sides
2y=-20
divide both sides by 2
y=-10
sub back
x=5+y
x=5-10
x=-5
the numbers are -10 and -5
256.44 (a day I believe is correct)
22.5 because 30/4 = 7.5 and 7.5 * 3 = 22.5
8a² - 4b + 7a² and 5(3a² - 2b) + 6
First, simplify the expressions.
1) 8a² - 4b + 7a²
Add like terms.
15a² - 4b
2) 5(3a² - 2b) + 6
Distribute 5 by multiplying the number to each terms inside the parenthesis.
15a² - 10b + 6
15a² - 4b ≠ 15a² - 10b + 6
Solution: The expressions are not equivalent.