Sorry if this is in the wrong section I am not sure what this is categorized as. I have a problem regarding the equation for a straight line. I have the following question and solution but im really not sure if I am right to drop the units. Could anyone help please?

· The equation for a straight line is often used in science to find an unknown without reference to a graph. For a set of data for two quatities,AandB, whereAis plotted on thex-axis andBon they-axis, the gradient of the straight line is 2.3 × 10^{4}m s^{−1}and the intercept on they-axis is 5.8 × 10^{4}m. Using the equation for a straight line (Book 3, Equation 7.12 ) as your starting point, determine the value forAwhenB= 6.2 × 10^{5}m. Show all your workings and give your answer in scientific notation and to two significant figures.

Y =mx + c

C = 5.8 × 10^{4}m

M= 2.3 × 10^{4}m s^{−1}

B= 6.2 × 10^{5}m

6.2 × 10^{5}= 2.3 × 10^{4}A + 5.8 × 10^{4}

6.2 × 10^{5}- 5.8 × 10^{4}= 2.3 × 10^{4}A

620000 – 58000= 23000 A

562000 = 23000 A

= A

562000

23000

24.434782608695652173913043478261 = A

A = 24 to 2 significant figures.