Question

7x -4y=20 for y when x=5

Answer 1

substitute x = 5 in the equation and solve for y.

Answer 2

Why do you multiply 4 and 20?

Answer 3

7x -4y=20 for y when x=5
Put x = 5 in the equation:
7*5 - 4*y = 20
35 - 4*y = 20
subtract 20 from both sides:
35 - 20 - 4*y = 0
15 - 4*y = 0
add 4*y to both sides
15 = 4*y
divide both sides by 4
15/4 = y
y = 15/4 or 3&3/4 or 3.75

Answer 4

cool thanks