7x+2y=3 and x-3y=30, what is the value of y?

y = -9

x = 3

Step-by-step explanation:

in order to determine the value of y in the equation we would say let

7x+2y=3 equation 1

x-3y=30 equation 2

from equation 2

x-3y=30 equation

x = 30 + 3y equation 3

substitute for equation 3 into equation 1

7x+2y=3 equation 1

7( 30 + 3y) + 2y = 3

210 + 21y + 2y = 3

210 + 23y = 3

combine the like terms

23y = 3 - 210

23y = - 207

divide both sides by the coefficient of y

23y/23 = -207/23

y = -9

substitute for y =-9 into equation 3

x = 30 + 3y equation 3

x = 30 + 3(-9)

x = 30 -27

x = 3

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168