Answer:
(- 2, 4 )
Step-by-step explanation:
y = 2x + 8 → (1)
y = - 2x → (2)
substitute y = 2x + 8 into (2)
2x + 8 = - 2x ( add 2x to both sides )
4x + 8 = 0 ( subtract 8 from both sides )
4x = - 8 ( divide both sides by 4 )
x = - 2
substitute x = - 2 into (2)
y = - 2(- 2) = 4
solution is (- 2, 4 )
Answer:
True
Step-by-step explanation:
minus into minus = plus
Answer:
y = 4 · ½ˣ
Step-by-step explanation:
It passes through the point (0, 4), so:
4 = a · b⁰
a = 4
It passes through the point (2, 1), so:
1 = 4 · b²
1/4 = b²
b = ½
y = 4 · ½ˣ
2/5 of 50=20
1/5 of 100=20
therefore, this is correct
