Solve system of equations by substitution

X=1, y=3

Step-by-step explanation:

X + y = 4

y=3x

x+ 3x=4 substitute y value of second equation (3x) in y value of 1st equation

4x=4 solve for x

x=1

solve for y by putting x value (4) in either equation:

x+y=4

1+y=4

y=3

check answers using both equations:

x+y=4

1+3=4

4=4

or

y=3x

3=3(1)

3=3

180 square centimeters

step-by-step explanation:

the answer is a

step-by-step explanation: