X^2 - 4x - 4y = 0 in standard form

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

The coordinate grid shows points a through k. which points are solutions to the system of inequalities listed below? 2x+ ys 10 2x 4y < 8 oa c, d, k o e, f. g, j oa, c, d, h, k oe, f. g, h, j

Will gve pints stars and brainliest