If 3x + 3y = 4 and 2x + 7y = 8, then what is x?

I will try to solve your system of equations.

3x+3y=4; 2x+7y=8

Step: Solve3x+3y=4for x:

3x+3y+-3y=4+-3y (Add - 3y to both sides)

3x=-3y+4

3x3=-3y+43 (Divide both sides by 3)

x=-y+43

Step: Substitute-y+43forxin2x+7y=8:

2x+7y=8

2 (-y+43) + 7y=8

5y+83=8 (Simplify both sides of the equation)

5y+83+-83=8+-83 (Add (-8) / 3 to both sides)

5y=163

5y5=1635 (Divide both sides by 5)

y=1615

Step: Substitute1615foryinx=-y+43:

x=-y+43

x=-1615+43

x=415 (Simplify both sides of the equation)