Solve the solving system by substitution Y=x+9 3x+8y=-5

The solution of the two equations is and

Explanation:

The two equations are and

Let us determine the solution of the equation using substitution method.

Thus, substituting in the equation , we get,

Multiplying the terms within the bracket, we have,

Subtracting both sides of the equation by -72, we get,

Dividing both sides of the equation by 11, we have,

Now, substituting in the equation , we get,

Thus, the solution of the two equations is and

Step-by-step explanation:

Given that y= x+9  (i)

                 3x+8y= -5 (ii)

required: the value of x and y

now take equation (i) above substitute into equation (ii), we get

  3x+8(x+9)= -5

11x+72= -5

11x= -77 divide by 11, we get

x= -7

now from

y= x+9, but x= -7

y= -7+9= 2

y=2

therefore the value of x= -7 and y= 2

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3