Question

If a point (a, 2/5) is on the graph of 10x + 5y = 20, what is the value of a?

a) a = 4
b) a = 2
c) a = -2
d) a = -4

Answer 1

To find the value of a, we can substitute the given point (a, 2/5) into the equation 10x + 5y = 20. Solving the equation, we find that a = 1.8.

Step-by-step explanation:

To find the value of a, we can substitute the given point (a, 2/5) into the equation 10x + 5y = 20. Plugging in the values, we have 10a + 5(2/5) = 20. Simplifying the equation, we get 10a + 2 = 20. Subtracting 2 from both sides, we have 10a = 18. Finally, dividing both sides by 10, we find that a = 1.8. Therefore, the correct answer is not among the given options, and the value of a is 1.8.