3. solve these systems of equations by the substitution method.
a.
* = 3y - 7
4x + 3y = 2

Y=2

X=-1

Step-by-step explanation:

In substitution method we have to put the value of one variable from first equation to the another given equation.

here equation are

x=3y-7     a

4x+3y=2   b

put the value of x from equation first into the second equation

so, 4(3y-7)+3y=2

     (12y-28)+3y=2

     15y-28=2

     15y=2+28

     15y=30

or    y=30/2=2

now put this y value in equation a

x=3(2)-7

x=6-7=-1

hence y=2 and x= -1

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.