Use substitution to solve the sy
2x+3y = 19
x = 2y-1
Solve for x and y

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

What number is 7 units left of -15?

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle