Question

substitute x=-4/9 and y = 1/2 into the expression 3y - 8x, Olivia thinks the correct answer is 3(1/2) - 8 (1/2), however she is incorrect. find Olivia's mistakecorrectly substitute x = 4/9 and y = 1/2 into the expression 3y-8x

Answer 1

Part A

The given expression is

3y - 8x

Given that x = - 4/9 and y = 1/2, by substituting, her answer was

3(1/2) - 8(1/2)

Her mistake was that she put x = 1/2 in the place of x instead of x = - 4/9

The correct expression would be

3(1/2) - 8(- 4/9)

= 3/2 - - 32/9

= 3/2 + 32/9