Answer:
a = 8 and b = 5
Step-by-step explanation:
A - B = 3
A + B = 13
2A = 16
A = 8
8 - B = 3
B = 5
Answer:
x^2 + 5x - 84 = 0
x = 7
Step-by-step explanation:
let the sister's age = y
sister's age (y) = 5 + x equation 1
xy = 84 equation 2
Make y the subject of the formula in equation 2
y = 84/x
equate equation 1 and 2
84/x = 5 + x equation 3
Multiply equation 3 by x
84 = 5x + x^2
x^2 + 5x - 84 = 0
tjis can be solved using quadratic equation
x^2 -7x + 12x -84 = 0
x(x + 12) -7(x + 12)
x = 7 or - 12
age cant be negative so his age is 7
Answer:
on edgenuity its y= -1.5x+23
the second answer is 11
hope this helps.
Answer:
x2 - 5x - 6 + -23/x-3Step-by-step explanation:
143o
interior angles of a triangle always add up to 180o
