Dani's estimate for the cost of tiling her bathroom floor is $50 plus $3 per square foot. Write a linear equation showing the total cost.

Let x represent the number of square ft. which needs to be tiled up and y represent the cost of tiling them

then $50 is the basic cost then y can be written as

y = 50 + 3x

which is straight line of slope 3 and y intercept 50

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

the value of x is equal to 0.