Help Please I need this turned in before grades get put in

Step-by-step explanation:

you know the value of y.

so substitute it into the first equation

-4x + 7(3x+15) = 20

now solve for x

-4x +21x + 105 = 20

17x + 105 =20

17x = -85

x = -5

now put the value of x into the y equation.

y = 3(-5) +15

y = -15 + 15

y = 0

his first public project he is asked to create a small scale drawing. the garden is a right triangle with base 25m and height 30m. are you trying to solve for the last side/hypotenuse? the irrational form of the answer would be 5\sqrt{61}