Question

What’s the value of Y when X=9
-7x+8y=39

Answer 1

y = 12.75

Explanation:

Step 1: Plug in 9 for x and simplify on the left-hand side of the equation:

-7(9) + 8y = 39

-63 + 8y = 39

Step 2: Add 63 to both sides:

(-63 + 8y = 39) + 63

8y = 102

Step 3: Divide both sides by 8 to solve for y:

(8y = 102) / 8

y = 12.75

Thus, 12.75 is the value of y when x = 9