Question

Solve using substitution y=3x-5 2x+5y=-42

Answer 1

Answer:

Solution point is (-1,-9)

Step-by-step explanation:

Put the value of y in the first equation into the second equation.

• 2x + 5(3x - 5) = - 42            Remove the brackets on the left
• 2x + 15x - 25 = - 42            Combine like terms on the left
• 17x - 25 = - 42                     Add 25 to both sides
• 17x - 25 + 25 = - 42 + 25    Do the addition
• 17x = - 17                              Divide by 17
• 17x/17 = -17/17                      Do the division
• x = - 1    

=======

Solve for y

• y = 3x - 6
• x = -1
• y = 3(-1) - 6
• y = -3 - 6
• y = - 9