Lin’s father is paying for a $20 meal. He has a 15%-off coupon for the meal. After the discount, a 7% sales tax is applied.
1 answer:
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Take two points to find the slope
Let;s take (1, -3) and (-3, -1)
Point slope formula is
m =
or
y₂-y₁ = m×(x₂-x₁) Which is the same thing
m =
=
It can be simplified:
=
Now we found the slope
Same formula:
y₂-y₁ = m × (x₂-x₁)
Substitute the point only (1, -3)
y₂-(-3) = × (x₂-1)
y₂ + 3 = × (x₂ - 1) (minus minus = plus)
The last option is the answer
Let;s take (1, -3) and (-3, -1)
Point slope formula is
m =
or
y₂-y₁ = m×(x₂-x₁) Which is the same thing
m =
=
It can be simplified:
=
Now we found the slope
Same formula:
y₂-y₁ = m × (x₂-x₁)
Substitute the point only (1, -3)
y₂-(-3) =
y₂ + 3 =
The last option is the answer