4
algebra

What is the intersection point of the lines y=3x4y = 3x - 4 and y=2x+6y = -2x + 6?

A

(3,5)(3, 5)

B

(1,1)(1, -1)

C

(2,2)(2, 2)

D

(4,8)(4, 8)

Correct Answer: C

Choice C is the correct answer. To find the intersection, we set the two expressions for yy equal to each other.

Step 1: Set the equations equal: 3x4=2x+63x - 4 = -2x + 6

Step 2: Solve for xx: 3x+2x=6+43x + 2x = 6 + 45x=105x = 10x=2x = 2

Step 3: Find yy using either equation (using the first): y=3(2)4=64=2y = 3(2) - 4 = 6 - 4 = 2

Solution: (2,2)(2, 2)

Verification: 2=2(2)+6=4+6=22 = -2(2) + 6 = -4 + 6 = 2

💡 Strategic Tip: The intersection point is where both lines have the same xx and yy values.

Choice A is incorrect because5=3(3)4=94=55 = 3(3) - 4 = 9 - 4 = 5 ✓, but 5 eq2(3)+6=05 \ eq -2(3) + 6 = 0.

Choice B is incorrect because1=3(1)4=1-1 = 3(1) - 4 = -1 ✓, but 1 eq2(1)+6=4-1 \ eq -2(1) + 6 = 4.

Choice D is incorrect because8=3(4)4=88 = 3(4) - 4 = 8 ✓, but 8 eq2(4)+6=28 \ eq -2(4) + 6 = -2.