Question

what is the value of y in the equation 5x + 2y = 20, when x = 0.3?
○ 2.5
○ 2.8
○ 9.25
○ 10.75

Explanation:

Step1: Substitute x=0.3 into equation

Substitute \( x = 0.3 \) into \( 5x + 2y = 20 \), we get \( 5\times0.3 + 2y = 20 \).

Step2: Simplify the left - hand side

Calculate \( 5\times0.3=1.5 \), so the equation becomes \( 1.5 + 2y = 20 \).

Step3: Solve for y

Subtract 1.5 from both sides: \( 2y=20 - 1.5=18.5 \). Then divide both sides by 2: \( y=\frac{18.5}{2} = 9.25 \).

Answer:

9.25 (corresponding to the option with 9.25)