Exercise 27 Page 85

To solve the equation we have to isolate y on one side of the equation. By dividing both sides of the equation by -7, we can remove the coefficient from y.

-7y=28

DivEqn

.LHS /(-7).=.RHS /(-7).

-7y/-7=28/-7

DivNegNeg

- a/- b=a/b

y=28/-7

CalcQuot

Calculate quotient

y=-4

To check that we have the correct solution, we can substitute y=-4 into the original equation.

-7y=28

Substitute

y= -4

-7( -4)? =28

MultNegNegOnePar

- a(- b)=a* b

7 * 4? =28

Multiply

Multiply

28=28

Since both sides are equal, we can conclude that y=-4 is the correct solution.