Question

module 11 (linear equations) assignment
score: 14/20 answered: 14/20
question 15
given the formula y = 2x - 1
a. find y when x = -4
y =
b. find x when y = 9
x =
submit question

Explanation:

Part a

Step1: Substitute \( x = -4 \) into \( y = 2x - 1 \)

\( y = 2\times(-4) - 1 \)

Step2: Calculate the value

First, calculate \( 2\times(-4)= -8 \), then \( -8 - 1 = -9 \)

Step1: Substitute \( y = 9 \) into \( y = 2x - 1 \)

\( 9 = 2x - 1 \)

Step2: Solve for \( x \)

Add 1 to both sides: \( 9 + 1 = 2x \), so \( 10 = 2x \). Then divide both sides by 2: \( x=\frac{10}{2}=5 \)

Answer:

\( y = -9 \)

Part b