Step-by-step explanation:
x - y + 5z = 29
y + 2z = 4
z = 7
since z = 7 we can use this value in second equation
y + 2×7 = 4 and y = -10
now we know the value of y we can solve the first equation
x -(-10) + 5×7 = 29
x + 10 + 35 = 29
x = -11
Answer:
C. 56
Step-by-step explanation:
252/4.5=56
Using the formula you can get this answer
Ok so we start with 80 books and remove 50% so 40
2/5 of 40 is 16
16 books
Answer:
5
Step-by-step explanation:
the formula of the distance between
the point (p, q) and the line ax + by +c = 0 =>
d = |p.a + q.b +c| / √(a²+b²)
d = |5(-3)+5(-4)+10| / √[(-3)²+(-4)²]
= |(-15-20+10)|/√25
= |-25|/ 5
= 25/5
= 5